Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Schedule of Net Contract Assets (Liabilities) (Detail)

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Revenue Recognition - Schedule of Net Contract Assets (Liabilities) (Detail) - USD ($)
$ in Thousands
6 Months Ended
Sep. 30, 2018
Apr. 01, 2018
Mar. 31, 2018
Revenue From Contract With Customer [Abstract]      
Unbilled revenue $ 10,582 $ 6,092 $ 8,079
Customer deposits (contract liabilities) (30,539) (26,585) $ (13,213)
Net contract liabilities (19,957) $ (20,493)  
Unbilled revenue (contract assets) 4,490    
Customer deposits (contract liabilities) (3,954)    
Net contract liabilities $ 536