Retirement Plans (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2017	Nov. 30, 2016	Feb. 28, 2017
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amortization of Gain (Loss)	$ (500,000)	$ (400,000)	$ (1,400,000)	$ (1,200,000)
Contributions to pension plan			6,000,000
Anticipated contribution during remainder of fiscal year	$ 0		$ 0
Expected rate of return on plan assets					7.75%