Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Operating Leases (Details)

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Commitments and Contingencies - Operating Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]      
Payments for Rent $ 2,400    
Annual rental expenses for operating leases 13,300 $ 10,700 $ 6,700
Minimum lease payments      
2019 10,898    
2020 8,536    
2021 5,766    
2022 5,322    
2023 4,080    
Thereafter $ 13,709