Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 11 Months Ended 12 Months Ended
Apr. 30, 2010
Mar. 31, 2011
Mar. 31, 2013
Mar. 31, 2012
Commitments and Contingencies        
Totaled arrangements under letter of credit guarantees and performance bonds securing performance obligations     $ 15,398  
Guarantee obligations secured by cash deposits     1,978  
Guarantee obligations represented by a reduction of the available amount of the company's short term and long term revolving lines of credit     13,420  
Cash deposits pledged as collateral on performance bonds and letters of credit     1,978 2,398
Lease expense 156 1,712 2,362 2,021
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
2014     3,077  
2015     2,634  
2016     2,304  
2017     1,493  
2018     1,138  
Thereafter     1,807  
Operating Leases, Future Minimum Payments Due     12,453  
Service fee expense 92 1,010 1,160 1,026
Purchase Obligation, Fiscal Year Maturity [Abstract]        
2014     630  
2015     453  
2016     155  
2017     38  
2018     0  
Thereafter     0  
Purchase Obligation     1,276  
Changes in the product liability        
Balance at beginning of period 699 756 857 1,325
Provision for warranties issued 58 1,662 15 445
Settlements (1) (1,093) (320) (913)
Balance at end of period 756 1,325 552 857
Settlement consideration paid     1,000  
Notice of Tax Dispute with the Canada Revenue Agency [Member]
       
Purchase Obligation, Fiscal Year Maturity [Abstract]        
Tax due that is requested by the Agency     3,000  
Raw Materials [Member]
       
Purchase Obligation, Fiscal Year Maturity [Abstract]        
Purchase Obligation     $ 3,543