New Accounting Pronouncements (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
	Nov. 30, 2016	Feb. 29, 2016	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2016	Nov. 30, 2015
ASU 2015-17 | Current deferred tax assets, net
New Accounting Pronouncements
Impact of recent accounting changes	$ (23,303)	$ (17,636)
ASU 2015-17 | Long-term deferred tax assets, net
New Accounting Pronouncements
Impact of recent accounting changes	1,207	879
ASU 2015-17 | Long-term deferred tax liabilities, net
New Accounting Pronouncements
Impact of recent accounting changes	(22,096)	(16,757)
ASU 2015-03 | Other assets – debt issuance costs
New Accounting Pronouncements
Impact of recent accounting changes	(12,706)	(12,618)
ASU 2015-03 | Other assets – accumulated amortization
New Accounting Pronouncements
Impact of recent accounting changes	(9,500)	(8,625)
ASU 2015-03 | Long-term debt, current maturities
New Accounting Pronouncements
Impact of recent accounting changes	(1,172)	(1,156)
ASU 2015-03 | Long-term debt, excluding current maturities
New Accounting Pronouncements
Impact of recent accounting changes	(2,033)	$ (2,837)
ASU 2016-09 | Accrued income taxes
New Accounting Pronouncements
Impact of recent accounting changes			$ 294	$ 396	$ 1,638	$ 989
ASU 2016-09 | Share-based compensation tax benefit
New Accounting Pronouncements
Impact of recent accounting changes			(294)	$ (396)	(1,638)	$ (989)
ASU 2016-09 | Share-based compensation expense
New Accounting Pronouncements
Impact of recent accounting changes			435		1,126
ASU 2016-09 | Income tax expense
New Accounting Pronouncements
Impact of recent accounting changes			$ (294)		$ (1,638)
ASU 2016-09 | Long-term deferred tax assets, net
New Accounting Pronouncements
Impact of recent accounting changes	(232)
ASU 2016-09 | Additional paid-in capital
New Accounting Pronouncements
Impact of recent accounting changes	588
ASU 2016-09 | Retained earnings
New Accounting Pronouncements
Impact of recent accounting changes	$ (820)