| Component: (Network and Table) | |
|---|---|
| Network | 40804 - Disclosure - Goodwill And Other Intangible Assets (Schedule Of Expected Future Amortization Expense) (Details) (http://www.amsc.com/role/DisclosureGoodwillAndOtherIntangibleAssetsScheduleOfExpectedFutureAmortizationExpenseDetails)  | 
| Table | (Implied) | 
| Reporting Entity [Axis] | 0000880807 (http://www.sec.gov/CIK) | 
| Goodwill And Other Intangible Assets [Abstract] | Period [Axis] | 
|---|---|
2011-04-01 - 2012-03-31  | |
Goodwill And Other Intangible Assets [Abstract]  | |
2013  | 1,007,000    | 
2014  | 770,000    | 
2015  | 573,000    | 
2016  | 568,000    | 
2017  | 553,000    | 
Thereafter  | 301,000    | 
Total  | 3,772,000    |