Credit Facility - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	9 Months Ended
	Jan. 25, 2020	Oct. 26, 2019	Jan. 25, 2020	Jan. 26, 2019	Apr. 27, 2019	Oct. 27, 2018
Line of Credit Facility [Line Items]
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. In connection with the waiver, the applicable margin for credit extensions made under the FILO Facility after March 2, 2020 through the end of 2020 was increased by 0.50% (to 3.25% per annum for LIBO rate loans and 2.25% for base rate loans).
Line Of Credit Potential Increase Amount	$ 100,000		$ 100,000
Proceeds from Lines of Credit	383,400		383,400	$ 374,000
Repayments of Lines of Credit	451,000		451,000	500,300
Letters of Credit Outstanding, Amount	4,759		4,759	5
Long-term Line of Credit, Noncurrent	65,900	$ 0	65,900	70,100	$ 33,500	$ 0
Short-term Debt	0	$ 0	0	$ 0	$ 100,000	$ 0
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