CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016
Statement of Financial Position [Abstract]
Trade accounts receivable, allowances (in dollars)	$ 31,418	$ 30,195
Accumulated depreciation	169,010	163,807
Accumulated amortization	$ 47,241	$ 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	32,035,000	32,020,000
Common stock, outstanding shares	32,035,000	32,020,000