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, 2018
Mar. 31, 2017
Mar. 31, 2016
Commitments and Contingencies      
Totaled arrangements under letter of credit guarantees and performance bonds securing performance obligations $ 20,392    
Guarantee obligations secured by cash deposits 2,448    
Guarantee obligations represented by a reduction of the available amount of the company's short term and long term revolving lines of credit 4,616    
Cash deposits pledged as collateral on performance bonds and letters of credit 2,448 $ 1,450  
Lease expense 3,738 3,441 $ 3,200
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2019 3,152    
2020 2,434    
2021 1,788    
2022 1,531    
2023 1,187    
Thereafter 1,854    
Operating Leases, Future Minimum Payments Due 11,946    
Service fee expense 3,439 3,095 1,865
Purchase Obligation, Fiscal Year Maturity [Abstract]      
2019 902    
2020 59    
2021 28    
2022 21    
Purchase Obligation 1,010    
Changes in the product liability      
Balance at beginning of period 300 460 429
Provision for warranties issued 281 143 490
Settlements (281) (303) (459)
Balance at end of period $ 300 $ 300 $ 460