Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 30, 2016	Jan. 31, 2015	Jan. 30, 2016	Jan. 31, 2015
Income Taxes [Line Items]
Income taxes	$ 51,618	$ 88,583	$ 20,071	$ 54,474
Income (loss) before taxes	$ 131,880	$ 127,560	$ 65,379	$ 90,365
Effective income tax rate	39.10%	69.40%	30.70%	60.30%