Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Nov. 25, 2011	Feb. 28, 2011	Nov. 26, 2010
Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Total	$ 12,031	$ 10,094	$ 10,643
Nonrecurring [Member]
Assets measured on a recurring and non-recurring basis:
Assets held for sale		5,282	5,557
Total		5,282	5,557
Quoted prices in active markets for identical assets and liabilities (Level 1) [Member] | Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Total	12,031	10,094	10,643
Quoted prices in active markets for identical assets and liabilities (Level 1) [Member] | Nonrecurring [Member]
Assets measured on a recurring and non-recurring basis:
Assets held for sale		0	0
Total		0	0
Quoted prices in active markets for similar assets and liabilities (Level 2) [Member] | Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Total	0	0	0
Quoted prices in active markets for similar assets and liabilities (Level 2) [Member] | Nonrecurring [Member]
Assets measured on a recurring and non-recurring basis:
Assets held for sale		5,282	5,557
Total		5,282	5,557
Significant unobservable inputs (Level 3) [Member] | Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Total	0	0	0
Significant unobservable inputs (Level 3) [Member] | Nonrecurring [Member]
Assets measured on a recurring and non-recurring basis:
Assets held for sale		0	0
Total		0	0
Active employees' medical plan trust assets [Member] | Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Fair Value of Investments, measured on recurring basis	3,312	3,223	4,261
Active employees' medical plan trust assets [Member] | Quoted prices in active markets for identical assets and liabilities (Level 1) [Member] | Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Fair Value of Investments, measured on recurring basis	3,312	3,223	4,261
Active employees' medical plan trust assets [Member] | Quoted prices in active markets for similar assets and liabilities (Level 2) [Member] | Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Fair Value of Investments, measured on recurring basis	0	0	0
Active employees' medical plan trust assets [Member] | Significant unobservable inputs (Level 3) [Member] | Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Fair Value of Investments, measured on recurring basis	0	0	0
Deferred Compensation plan assets [Member] | Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Fair Value of Investments, measured on recurring basis	8,719	6,871	6,382
Deferred Compensation plan assets [Member] | Quoted prices in active markets for identical assets and liabilities (Level 1) [Member] | Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Fair Value of Investments, measured on recurring basis	8,719	6,871	6,382
Deferred Compensation plan assets [Member] | Quoted prices in active markets for similar assets and liabilities (Level 2) [Member] | Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Fair Value of Investments, measured on recurring basis	0	0	0
Deferred Compensation plan assets [Member] | Significant unobservable inputs (Level 3) [Member] | Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Fair Value of Investments, measured on recurring basis	$ 0	$ 0	$ 0