Credit Facility - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Oct. 31, 2020	Oct. 31, 2020	Oct. 26, 2019	May 02, 2020
Line of Credit Facility [Line Items]
Line Of Credit Potential Increase Amount	$ 100,000	$ 100,000
Debt Instrument, Description		On March 2, 2020, we were granted a waiver to the condition to the upcoming draw under the FILO Facility, scheduled for April 2020, that Consolidated EBITDA (as defined in the Credit Agreement) minus Restricted Payments (as defined in the Credit Agreement) equal at least $90,000.
Proceeds from Lines of Credit	330,800	$ 330,800	$ 150,000
Repayments of Lines of Credit	406,000	406,000	283,500
Long-term Line of Credit, Noncurrent	99,500	99,500	0	$ 99,700
Short-term Debt	0	0	0	$ 75,000
Letters of Credit Outstanding, Amount	4,759	4,759	$ 4,759
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	500,000	$ 500,000
New Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit Facility Maturity Term		5 years
Line of Credit Facility, Maximum Borrowing Capacity	400,000	$ 400,000
FILO [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 100,000	$ 100,000