Income Taxes - Provision of Income Taxes (Details) (USD $)	12 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2011
Income (loss) before income taxes:
Domestic	$ 92,334,000	$ 65,054,000	$ 56,184,000
Foreign	2,035,000	(1,413,000)	(1,226,000)
Income before income taxes	94,368,833	63,640,905	54,958,016
Current provision:
Federal	26,330,000	16,717,000	21,057,000
Foreign	(2,600,000)	159,000	370,000
State and Local	4,137,000	3,595,000	2,346,000
Total current provision for income taxes	27,866,000	20,470,000	23,773,000
Deferred provision (benefit):
Federal	2,024,000	3,646,000	(3,439,000)
Foreign	3,455,000	(1,330,000)	(161,000)
State and Local	568,000	119,000	(178,000)
Deferred Income Tax Expense (Benefit) Excluding Foreign Currency Transactions	6,047,000	2,435,000	(3,778,000)
Total provision for income taxes	$ 33,913,000	$ 22,905,000	$ 19,995,000