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Property, Plant and Equipment (Details) (USD $)
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12 Months Ended |
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Mar. 31, 2015
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Mar. 31, 2014
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Mar. 31, 2013
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| Property, Plant and Equipment |
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| Total property, plant and equipment, gross |
$ 34,355,000us-gaap_PropertyPlantAndEquipmentGross
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$ 35,534,000us-gaap_PropertyPlantAndEquipmentGross
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| Less accumulated depreciation |
(30,832,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
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(32,643,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
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| Total property, plant and equipment, net |
3,523,000us-gaap_PropertyPlantAndEquipmentNet
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2,891,000us-gaap_PropertyPlantAndEquipmentNet
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| Depreciation expense |
1,200,000us-gaap_Depreciation
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1,800,000us-gaap_Depreciation
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2,300,000us-gaap_Depreciation
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| Minimum |
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| Property, Plant and Equipment |
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| Estimated Useful Life |
2 years
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| Maximum |
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| Property, Plant and Equipment |
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| Estimated Useful Life |
10 years
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| Machinery, rental equipment, equipment, automobiles and furniture |
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| Property, Plant and Equipment |
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| Total property, plant and equipment, gross |
20,873,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cpst_MachineryRentalEquipmentEquipmentAutomobileAndFurnitureMember
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20,665,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cpst_MachineryRentalEquipmentEquipmentAutomobileAndFurnitureMember
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| Machinery, rental equipment, equipment, automobiles and furniture | Minimum |
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| Property, Plant and Equipment |
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| Estimated Useful Life |
2 years
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| Machinery, rental equipment, equipment, automobiles and furniture | Maximum |
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| Property, Plant and Equipment |
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| Estimated Useful Life |
10 years
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| Leasehold improvements |
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| Property, Plant and Equipment |
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| Total property, plant and equipment, gross |
9,760,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
|
9,731,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
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| Estimated Useful Life |
10 years
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| Molds and tooling |
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| Property, Plant and Equipment |
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| Total property, plant and equipment, gross |
$ 3,722,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ToolsDiesAndMoldsMember
|
$ 5,138,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ToolsDiesAndMoldsMember
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| Molds and tooling | Minimum |
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| Property, Plant and Equipment |
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| Estimated Useful Life |
2 years
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| Molds and tooling | Maximum |
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| Property, Plant and Equipment |
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| Estimated Useful Life |
5 years
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