Retirement Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Dec. 01, 2012	Nov. 26, 2011	Dec. 01, 2012	Nov. 26, 2011
Defined Benefit Pension Plan
Net periodic pension expense
Service cost	$ 868	$ 838	$ 2,603	$ 2,514
Interest cost	1,566	1,518	4,697	4,554
Expected return on plan assets	(1,749)	(1,505)	(5,247)	(4,515)
Amortization of unrecognized prior service cost	60	157	180	471
Amortization of unrecognized net loss (gain)	960	422	2,880	1,266
Net pension expense (income)	1,705	1,430	5,113	4,290
Change in plan assets:
Employer contributions	1,730		5,584
Expected employer contribution during the remainder of fiscal 2013	0		0
Nonqualified Executive Retirement Plan
Net periodic pension expense
Service cost		5		15
Interest cost	154	193	462	578
Net pension expense (income)	154	198	462	593
Change in plan assets:
Employer contributions	389		1,216
Expected employer contribution during the remainder of fiscal 2013	$ 425		$ 425

The amount of gains or losses recognized in net periodic benefit cost.

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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The increase in the fair value of plan assets from contributions made by the employer.

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The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

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- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- 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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- Definition

The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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-Glossary Service Cost (Component of Net Periodic Pension Cost)

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