CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Statement of Financial Position [Abstract]
Trade accounts receivable, allowances (in dollars)	$ 30,195	$ 18,218
Accumulated depreciation	163,807	129,002
Accumulated amortization	$ 45,302	$ 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	32,020,000	33,292,000
Common stock, outstanding shares	32,020,000	33,292,000