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Commitments and Contingencies (Detail) - USD ($)
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]      
Non-cancellable purchase commitments, 2022 $ 23,339,000    
Non-cancellable purchase commitments, 2023 5,266,000    
Non-cancellable purchase commitments, 2024 804,000    
Non-cancellable purchase commitments, 2025 and beyond 591,000    
Non-cancellable purchase commitments, Total for all periods through fiscal 2023 30,000,000    
Royalty expense $ 16,256,000 $ 12,545,000 $ 12,319,000
Maximum software warranty period (in days) 90 days    
Product warranty accrual $ 0 $ 0 $ 0