Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	May 25, 2012	Feb. 29, 2012	May 27, 2011
Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Total			$ 11,965
Nonrecurring [Member]
Assets measured on a recurring and non-recurring basis:
Assets held for sale			5,282
Total			5,282
Level 1 [Member] | Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Total			11,965
Level 2 [Member] | Nonrecurring [Member]
Assets measured on a recurring and non-recurring basis:
Assets held for sale			5,282
Total			5,282
Level 3 [Member] | Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Total
Level 3 [Member] | Nonrecurring [Member]
Assets measured on a recurring and non-recurring basis:
Assets held for sale
Total
Active employees' medical plan trust assets [Member] | Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Assets measured on a recurring basis			3,277
Active employees' medical plan trust assets [Member] | Level 1 [Member] | Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Assets measured on a recurring basis			3,277
Active employees' medical plan trust assets [Member] | Level 3 [Member] | Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Assets measured on a recurring basis
Deferred Compensation plan assets [Member] | Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Assets measured on a recurring basis	9,505	9,198	8,688
Deferred Compensation plan assets [Member] | Level 1 [Member] | Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Assets measured on a recurring basis	9,505	9,198	8,688
Deferred Compensation plan assets [Member] | Level 3 [Member] | Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Assets measured on a recurring basis