Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Commitments and Contingencies      
Totaled arrangements under letter of credit guarantees and performance bonds securing performance obligations $ 11,213    
Guarantee obligations secured by cash deposits 1,450    
Guarantee obligations represented by a reduction of the available amount of the company's short term and long term revolving lines of credit 3,461    
Cash deposits pledged as collateral on performance bonds and letters of credit 1,450 $ 1,408  
Lease expense 3,441 3,200 $ 2,904
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2018 2,753    
2019 1,561    
2020 1,297    
2021 1,027    
2022 771    
Thereafter 519    
Operating Leases, Future Minimum Payments Due 7,928    
Service fee expense 3,095 1,865 2,225
Purchase Obligation, Fiscal Year Maturity [Abstract]      
2018 1,395    
2019 217    
Purchase Obligation 1,612    
Changes in the product liability      
Balance at beginning of period 460 429 645
Provision for warranties issued 143 490 368
Settlements (303) (459) (584)
Balance at end of period 300 460 429
CHS Transactions      
Changes in the product liability      
Consideration received to settle the CHS Transactions     1,700
Gain on settlement of related party transactions $ 0 $ 0 $ 931