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Indebtedness - Summary of Debt (Details) - USD ($)	Jul. 31, 2020	Mar. 30, 2020	Oct. 31, 2019	Aug. 02, 2019	Jun. 27, 2019	Apr. 30, 2019	Mar. 31, 2019
Debt Instrument [Line Items]
Less: unamortized discounts, debt issuance costs, and deferred charges	$ 3,057,000		$ 3,103,000	$ 3,219,000
Total long-term debt	890,905,000		700,813,000	720,681,000
Less: current portion of long-term debt	(108,869,000)		(79,914,000)	(99,877,000)
Long-term debt, less current portion	782,036,000		620,899,000	620,804,000
Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	$ 100,000,000		100,000,000	100,000,000
Debt instrument, interest rate, stated percentage	7.80%
6.625% senior notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 123,962,000		123,916,000	123,900,000
Debt instrument, interest rate, stated percentage	6.625%
Senior Notes \| $200 million term loan
Debt Instrument [Line Items]
Long-term debt, gross	$ 100,000,000		100,000,000	100,000,000
Debt instrument, face amount	200,000,000						$ 200,000,000.0
Senior Notes \| $300 million term loan
Debt Instrument [Line Items]
Long-term debt, gross	180,000,000		180,000,000	200,000,000
Debt instrument, face amount	300,000,000						$ 300,000,000.0
Senior Notes \| $190 million term loan
Debt Instrument [Line Items]
Long-term debt, gross	190,000,000		0	0
Debt instrument, face amount	$ 190,000,000	$ 190,000,000.0
Debt instrument, interest rate, stated percentage	0.75%
Less: current portion of long-term debt	$ (108,900,000)
Long-term debt, less current portion	89,900,000
Senior Notes \| 3.81% series A senior notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 100,000,000		100,000,000	100,000,000
Debt instrument, face amount					$ 100,000,000.0	$ 100,000,000.0
Debt instrument, interest rate, stated percentage	3.81%					3.81%
Senior Notes \| 3.91% series B senior notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 100,000,000		100,000,000	100,000,000
Debt instrument, face amount					$ 100,000,000.0	$ 100,000,000.0
Debt instrument, interest rate, stated percentage	3.91%					3.91%
Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	$ 0		$ 0	$ 0