Pension and Other Postretirement Benefit Plans - Additional Information (Detail) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Oct. 31, 2015 USD ($)	Jan. 31, 2015 USD ($) Employee	Nov. 01, 2014 USD ($)	Oct. 31, 2015 USD ($)	Nov. 01, 2014 USD ($)	May. 02, 2015 USD ($) Employee
Pension and Other Postretirement Benefit Plans [Line Items]
Increase in pension liability					$ 15,747	$ 3,062
(Increase) decrease in other comprehensive income, before tax					$ (15,747)	$ 6,503
Pension plan, expected termination period					18 months
Pension plan, expected termination period					24 months
Number of terminated vested participants elected to receive lump sum payments | Employee		735
Lump sum payments made to plan participants		$ 15,190
Number of remaining active and terminated vested participants elected to receive lump sum payments | Employee						2,300
Pension expense	$ 1,435		$ 778	$ 2,682	$ 1,385
Pension liabilities, current	11,799			11,799		$ 14,216
Company contributions, employee benefit expenses	2,661		2,933	6,173	6,450
Company contributions for postretirement plan	$ 38		$ 38	$ 75	$ 75
Selling and Administrative Expenses
Pension and Other Postretirement Benefit Plans [Line Items]
Pension plan settlement charge		$ 7,317