Components of Net Periodic Benefit Costs (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2011
Pension Plans, Defined Benefit
Components of Net Periodic Benefit Cost:
Interest Cost on Benefit Obligation	$ 574	$ 677	$ 674
Expected Return on Assets	(566)	(577)	(534)
Amortization of Net (Gain) Loss	630	431	389
Settlements and Curtailment
Net Periodic Benefit Cost	638	531	529
Other Postretirement Benefit Plans, Defined Benefit
Components of Net Periodic Benefit Cost:
Service Cost Benefits Earned During the Period	23	20	63
Interest Cost on Benefit Obligation	78	86	205
Amortization of Prior Service Cost	(276)	(276)	(64)
Amortization of Net (Gain) Loss	196	188	218
Settlements and Curtailment
Net Periodic Benefit Cost	$ 21	$ 18	$ 422