Benefit Plans (Benefit Plan Information) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 29, 2012
Defined Benefit Plan Disclosure [Line Items]
Obligation at beginning of year	$ 186,939	$ 164,524
Interest cost	8,016	7,757	7,348
Actuarial loss (gain)	(4,177)	17,278
Obligation at end of year	187,861	186,939	164,524
Plan assets at beginning of year	107,968	96,897
Actual return on plan assets	19,204	8,175
Employer contributions	457	5,516
Plan assets at end of year	124,712	107,968	96,897
Funded status recognized	(63,149)	(78,971)
Current liability	(451)	(453)
Noncurrent liability	(62,698)	(78,518)
Net amount recognized	(63,149)	(78,971)
Accumulated benefit obligation	187,861	186,939
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Obligation at beginning of year	177,531	154,632
Interest cost	7,583	7,299	6,830
Actuarial loss (gain)	(4,980)	17,766
Obligation at end of year	177,674	177,531	154,632
Plan assets at beginning of year	107,968	96,897
Actual return on plan assets	19,204	8,175
Employer contributions	0	5,062
Plan assets at end of year	124,712	107,968	96,897
Funded status recognized	(52,962)	(69,563)
Current liability	0	0
Noncurrent liability	(52,962)	(69,563)
Net amount recognized	(52,962)	(69,563)
Accumulated benefit obligation	177,674	177,531
Restoration Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Obligation at beginning of year	9,408	9,892
Interest cost	433	458	518
Actuarial loss (gain)	803	(488)
Obligation at end of year	10,187	9,408	9,892
Plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	457	454
Plan assets at end of year	0	0	0
Funded status recognized	(10,187)	(9,408)
Current liability	(451)	(453)
Noncurrent liability	(9,736)	(8,955)
Net amount recognized	(10,187)	(9,408)
Accumulated benefit obligation	10,187	9,408
Change In Projected Benefit Obligation [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	(2,917)	(2,620)
Change In Projected Benefit Obligation [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	(2,460)	(2,166)
Change In Projected Benefit Obligation [Member] | Restoration Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	(457)	(454)
Change In Fair Value Of Plan Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	(2,917)	(2,620)
Change In Fair Value Of Plan Assets [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	(2,460)	(2,166)
Change In Fair Value Of Plan Assets [Member] | Restoration Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	$ (457)	$ (454)