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Components of Net Postretirement Medical Expense (credit) (Detail) (Other Postretirement Benefit Plans, Defined Benefit, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 29, 2011	Oct. 30, 2010	Oct. 29, 2011	Oct. 30, 2010
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Interest expense on accumulated postretirement benefit obligation	$ 16	$ 17	$ 46	$ 52
Prior service cost amortization		(380)		(1,140)
Net amortization and deferral	50	130	152	391
Net expense (credit)	$ 66	$ (233)	$ 198	$ (697)

- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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