Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 29, 2012
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected contributions to the pension plan in fiscal 2015	$ 4,200,000
Estimated future amortization of actuarial losses	1,400,000
Pension Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets target allocation	75.00%
Pension Plan [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets target allocation	25.00%
Restoration Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected contributions to the pension plan in fiscal 2015	500,000
Estimated future amortization of actuarial losses	0
Retirement Savings Plan 401k [Member]
Defined Benefit Plan Disclosure [Line Items]
Total cost for company contributions	25,000,000	23,100,000	20,900,000
Retirement Restoration Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Retirement restoration plan cost	1,100,000	400,000	500,000
Executive Deferred Compensation Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Executive deferred compensation plan cost	$ 600,000	$ 400,000	$ 0