Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	May 31, 2019	Feb. 28, 2019
Statement of Financial Position [Abstract]
Accounts receivable, allowances for doubtful accounts	$ 4,452	$ 4,561
Property and equipment, accumulated depreciation and amortization	$ 331,642	$ 316,432
Preferred stock, per share par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, outstanding (in shares)	0	0
Common stock, per share par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	246,289,980	244,402,737
Common stock, shares outstanding (in shares)	178,083,153	176,800,502
Treasury stock, shares (in shares)	68,206,827	67,602,235