Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	May 31, 2017	Feb. 28, 2017	[1]
Statement of Financial Position [Abstract]
Accounts receivable, allowances for doubtful accounts	$ 3,247	$ 2,791
Property and equipment, accumulated depreciation and amortization	$ 247,389	$ 231,533
Preferred stock, per share par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, outstanding	0	0
Common stock, per share par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	237,789,357	236,804,594
Common stock, shares outstanding	177,520,153	176,901,936
Treasury stock, shares	60,269,204	59,902,658

[1] Derived from audited financial statements.