Credit Facility - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Jan. 27, 2018	Jan. 28, 2017	Feb. 27, 2017	Aug. 03, 2015
Line of Credit Facility [Line Items]
Line Of Credit Potential Increase Amount				$ 100
Proceeds from Lines of Credit	$ 481,600	$ 116,100
Repayments of Lines of Credit	528,200	$ 116,100
Loans Payable to Bank	113,000
Letters of Credit Outstanding, Amount	4,759
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