Credit Facility - Additional Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Oct. 27, 2018	Oct. 28, 2017	Apr. 28, 2018	Jan. 27, 2018	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	$ 119,900	$ 225,400
Repayments of Lines of Credit	316,300	343,200
Loans Payable to Bank	0	41,800
Letters of Credit Outstanding, Amount	4,759
Long-term Line of Credit, Noncurrent	0	41,800	$ 96,400
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