Components of Net Periodic Benefit Cost for Defined Benefit Plans and Other Post Retirement Plan (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2013	Aug. 31, 2012
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Interest Cost	$ 137	$ 146	$ 273	$ 291
Expected Return on Plan Assets	(163)	(143)	(326)	(285)
Amortization of Net Loss	150	164	299	327
Total Net Periodic Benefit Cost	124	167	246	333
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service Cost	6	6	11	11
Interest Cost	19	19	38	39
Amortization of Unrecognized Prior Service Cost	(69)	(69)	(138)	(138)
Amortization of Net Loss	50	49	101	98
Total Net Periodic Benefit Cost	$ 6	$ 5	$ 12	$ 10