Reconciliation of Operating Income (Loss) from Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 30, 2016	Jan. 31, 2015	Jan. 30, 2016	Jan. 31, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Reportable segments operating income	$ 133,856	$ 131,081	$ 72,612	$ 105,088
Interest expense, net and amortization of deferred financing costs	1,976	3,521	7,233	14,723
Consolidated income before taxes	$ 131,880	$ 127,560	$ 65,379	$ 90,365