Credit Facility - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Jan. 26, 2019	Jan. 27, 2018	Apr. 28, 2018	Oct. 28, 2017	Feb. 27, 2017	Aug. 03, 2015
Line of Credit Facility [Line Items]
Line Of Credit Potential Increase Amount						$ 100,000
Proceeds from Lines of Credit	$ 374,000	$ 481,600
Repayments of Lines of Credit	500,300	528,200
Loans Payable to Bank		113,000
Letters of Credit Outstanding, Amount	4,759
Long-term Line of Credit, Noncurrent	70,100	113,000	$ 96,400	$ 113,000
Short-term Debt	$ 0	0	$ 100,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity						$ 400,000
New Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 500,000
FILO [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$ 100,000