CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Mar. 31, 2016
Statement of Financial Position [Abstract]
Trade accounts receivable, allowances	$ 35,478	$ 30,195
Inventory valuation reserves	9,409	7,304
Accumulated depreciation	184,113	163,807
Accumulated amortization	$ 51,297	$ 45,302
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, authorized shares	125,000,000	125,000,000
Common stock, issued shares	31,919,000	32,020,000
Common stock, outstanding shares	31,919,000	32,020,000