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Composition of Certain Financial Statement Captions - Summary of Other Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Mar. 31, 2019
Other Assets Noncurrent Disclosure [Abstract]    
Capitalized commission costs $ 16,981 $ 14,781
Deposits 5,747 5,318
Debt issuance costs 2,479 2,834
Other noncurrent assets 7,810 9,545
Other assets $ 33,017 $ 32,478