CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Mar. 31, 2016
Statement of Financial Position [Abstract]
Trade accounts receivable, allowances (in dollars)	$ 30,830	$ 30,195
Accumulated depreciation	176,246	163,807
Accumulated amortization	$ 49,375	$ 45,302
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	32,084,000	32,020,000
Common stock, outstanding shares	32,084,000	32,020,000