Pension and Other Postretirement Benefit Plans - Additional Information (Detail) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended		12 Months Ended
	Apr. 30, 2016 USD ($)	Jan. 30, 2016 USD ($)	Jan. 31, 2015 USD ($) Employee	Nov. 01, 2014 USD ($)	Jan. 30, 2016 USD ($)	Jan. 31, 2015 USD ($)	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
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		$ 1,247	7,914		$ 3,930	$ 9,299
Pension liabilities, current		13,047			13,047		$ 14,216
Company contributions, employee benefit expenses		3,058	2,734		9,231	9,184
Company contributions for postretirement plan		$ 38	38		$ 113	$ 113
Scenario, Forecast
Pension and Other Postretirement Benefit Plans [Line Items]
Pension plan settlement charge	$ 21,000
Final cash funding at termination	$ 8,500
Selling and Administrative Expenses
Pension and Other Postretirement Benefit Plans [Line Items]
Pension plan settlement charge			$ 7,317