CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Mar. 31, 2015
Statement of Financial Position [Abstract]
Trade accounts receivable, allowances (in dollars)	$ 38,849	$ 18,218
Accumulated depreciation	156,344	129,002
Accumulated amortization	$ 43,702	$ 37,316
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares	125,000,000	125,000,000
Common stock, issued shares	32,381,000	33,292,000
Common stock, outstanding shares	32,381,000	33,292,000