Retirement Plans (Components Of Net Pension Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2012	Aug. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	$ 1,939	$ 1,839	$ 3,880	$ 3,676
Expected return on plan assets	(1,913)	(1,717)	(3,796)	(3,436)
Recognized actuarial loss	300	117	600	230
Net pension expense	326	239	684	470
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	1,824	1,708	3,650	3,416
Expected return on plan assets	(1,913)	(1,717)	(3,796)	(3,436)
Recognized actuarial loss	300	117	600	230
Net pension expense	211	108	454	210
Restoration Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	115	131	230	260
Expected return on plan assets	0	0	0	0
Recognized actuarial loss	0	0	0	0
Net pension expense	$ 115	$ 131	$ 230	$ 260