Reconciliation of Change in Benefit Obligation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2011
Change in Plan Assets:
Plan Assets at Fair Value, February 29 & February 28	$ 9,448	$ 8,517
Pension Plans, Defined Benefit
Change in Benefit Obligation:
Obligation, March 1	15,964	14,475
Interest Cost on Benefit Obligation	574	678
Plan Amendments
Actuarial (Gain) Loss	269	2,080
Benefit Payments	(1,256)	(1,269)
Curtailments
Other Plan Changes
Obligation, February 29 & February 28	15,551	15,964
Change in Plan Assets:
Plan Assets at Fair Value, March 1	8,517	8,305
Actual Return on Plan Assets	831	324
Company Contributions	1,356	1,157
Benefit Payments	(1,256)	(1,269)
Plan Assets at Fair Value, February 29 & February 28	9,448	8,517
Funded Status:
Funded Status	(6,103)	(7,447)
Other Postretirement Benefit Plans, Defined Benefit
Change in Benefit Obligation:
Obligation, March 1	1,958	1,842
Service Cost Benefits Earned During the Period	23	20	63
Interest Cost on Benefit Obligation	78	86
Plan Amendments
Actuarial (Gain) Loss	164	94
Benefit Payments	(237)	(84)
Curtailments
Other Plan Changes
Obligation, February 29 & February 28	1,986	1,958	1,842
Change in Plan Assets:
Company Contributions	237	84
Benefit Payments	(237)	(84)
Funded Status:
Funded Status	$ (1,986)	$ (1,958)