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Leases - Schedule of Reconciliation of Undiscounted Cash Flows for Operating and Finance Lease Liabilities (Detail) $ in Thousands	Apr. 30, 2020 USD ($)
Finance Lease [Abstract]
2020	$ 6,503
2021	4,420
2022	2,694
2023	1,243
2024	680
Later years	3,293
Total minimum lease payments	18,833
Amounts representing interest	1,561
Present value of minimum lease payments	17,272
Operating Lease [Abstract]
2020	19,870
2021	17,865
2022	15,426
2023	13,128
2024	11,350
Later years	63,655
Total minimum lease payments	141,294
Amounts representing interest	11,030
Present value of minimum lease payments	$ 130,264

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