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Credit Facility - Additional Information (Details) - USD ($)
$ in Thousands
9 Months Ended
Jan. 28, 2017
Jan. 30, 2016
Aug. 03, 2015
Debt Disclosure [Abstract]      
Proceeds from Lines of Credit $ 116,100 $ 60,600  
Line of Credit Facility, Maximum Borrowing Capacity     $ 400,000
Line Of Credit Potential Increase Amount     $ 100
Repayments of Lines of Credit 116,100 $ 60,600  
Letters of Credit Outstanding, Amount 4,298    
Long-term Line of Credit $ 0