Michael P. Huseby Resignation Charge - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
	Aug. 02, 2015	Oct. 31, 2015	Oct. 31, 2015
Restructuring Cost and Reserve [Line Items]
Value of shares issued pursuant to the accelerated vesting of the equity-based awards			$ (8,022)
Michael P. Huseby
Restructuring Cost and Reserve [Line Items]
Severance payment	$ 7,742
Shares issued pursuant to the accelerated vesting of the equity-based awards	300,000
Value of shares issued pursuant to the accelerated vesting of the equity-based awards	$ 8,022
Net cash payment related to resignation		$ 15,764
Michael P. Huseby | Selling and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Total resignation charge		$ 10,510