Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Feb. 29, 2012	Feb. 28, 2011
Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Total		$ 10,094
Nonrecurring [Member]
Assets measured on a recurring and non-recurring basis:
Assets held for sale		5,282
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		10,094
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
Significant unobservable inputs (Level 3) [Member] | Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Total
Significant unobservable inputs (Level 3) [Member] | Nonrecurring [Member]
Assets measured on a recurring and non-recurring basis:
Assets held for sale
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		3,223
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		3,223
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
Deferred Compensation plan assets [Member] | Recurring [Member]
Assets measured on a recurring and non-recurring basis:
Fair Value of Investments, measured on recurring basis	9,198	6,871
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	9,198	6,871
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