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Schedule by Year of Maturities of Operating Leases Liabilities with Original Terms in Excess of One Year (Detail) $ in Thousands	Apr. 30, 2020 USD ($)
Leases [Abstract]
2021 (excluding the three months ended April 30, 2020)	$ 254,187
2022	275,975
2023	242,272
2024	208,755
2025	172,243
Thereafter	589,212
Total undiscounted future minimum lease payments	1,742,644
Less imputed interest	(410,041)
Total discounted future minimum lease payments	$ 1,332,603

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