| Component: (Network and Table) | |
|---|---|
| Network | 100520 - Disclosure - Property, Plant and Equipment - Schedule of Cost and Accumulated Depreciation of Property and Equipment (Detail) (http://www.amsc.com/20160331/taxonomy/role/DisclosurePropertyPlantAndEquipmentScheduleOfCostAndAccumulatedDepreciationOfPropertyAndEquipmentDetail) |
| Table | Schedule Of Property Plant And Equipment [Table] |
| Reporting Entity [Axis] | 0000880807 (http://www.sec.gov/CIK) |
| Property Plant And Equipment [Line Items] | Period [Axis] | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2016-03-31 | 2015-03-31 | |||||||||||||
| Property, Plant and Equipment, Type | Property, Plant and Equipment, Type | |||||||||||||
| Land | Construction In Progress-Equipment | Buildings | Equipment And Software | Furniture and Fixtures | Leasehold Improvements | Property, Plant and Equipment, Type | Land | Construction In Progress-Equipment | Buildings | Equipment And Software | Furniture and Fixtures | Leasehold Improvements | Property, Plant and Equipment, Type | |
Property, plant and equipment, gross | ||||||||||||||
Less accumulated depreciation | ( | ( | ||||||||||||
Property, plant and equipment, net | 49,778,000 | 56,097,000 | ||||||||||||