CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Statement of Financial Position [Abstract]
Accounts receivable, allowances	$ 66,483	$ 45,552
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	119,813,000	103,765,000
Common stock, shares outstanding (in shares)	102,621,000	86,573,000
Treasury stock, shares (in shares)	17,192,000	17,192,000