v2.4.0.8
Document and Entity Information
9 Months Ended
Dec. 31, 2014
Feb. 02, 2015
Document Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Dec. 31, 2014  
Document Fiscal Year Focus 2014  
Document Fiscal Period Focus Q3  
Entity Registrant Name AMERICAN SUPERCONDUCTOR CORP /DE/  
Entity Central Index Key 0000880807  
Current Fiscal Year End Date --03-31  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   95,722,127