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Retirement Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Aug. 31, 2012	Feb. 29, 2012
Retirement Plans [Abstract]
Contributions to pension plan	$ 5.1
Anticipated contribution during remainder of fiscal year	$ 0
Expected long-term rate of return on plan assets		7.75%

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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