Annual report pursuant to Section 13 and 15(d)

Acquisition - Additional Information (Detail)

v2.4.0.8
Acquisition - Additional Information (Detail) (Energy Steel [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2013
Selling, General and Administrative Expenses [Member]
Mar. 31, 2012
Selling, General and Administrative Expenses [Member]
Mar. 31, 2013
Interest Expense [Member]
Mar. 31, 2012
Interest Expense [Member]
Business Acquisition [Line Items]              
Accounting and purchase price $ 17,899            
Acquisition-related costs     676        
Received from seller due to reduction in purchase price   384          
Purchase agreement included a contingent earn-out, minimum 0            
Purchase agreement included a contingent earn-out, maximum 2,000            
Earn-out paid during period   1,000          
Contingent earn-out liability adjustment       $ (975) $ 230 $ 44 $ 204
Lease term agreement 5 years            
Additional lease term agreement 5 years