Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2015	Nov. 01, 2014	Oct. 31, 2015	Nov. 01, 2014
Income Taxes [Line Items]
Income tax benefit	$ 25,558	$ 28,451	$ 4,233	$ 8,153
Income (loss) before taxes	$ 58,959	$ 65,402	$ 10,716	$ 18,891
Effective income tax rate	43.40%	43.50%	39.50%	43.20%