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Leases - Components of Lease Expense (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2021
Jan. 31, 2020
Finance lease cost        
Amortization of ROU assets $ 296 $ 467 $ 951 $ 1,410
Interest on lease liabilities 29 38 90 117
Finance lease cost 325 505 1,041 1,527
Operating lease cost 14,199 15,035 42,209 43,428
Short-term lease cost 113 335 325 891
Variable lease cost 3,157 3,988 8,349 10,064
ROU assets, impairment charge   2,282   2,282
Sublease income (186) (217) (461) (324)
Total lease cost $ 17,608 $ 21,928 $ 51,463 $ 57,868