CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Statement of Financial Position [Abstract]
Trade accounts receivable, allowances (in dollars)	$ 32,354	$ 30,195
Inventory reserves	7,638	7,303
Accumulated depreciation	190,758	163,807
Accumulated amortization	$ 54,361	$ 45,302
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares (in shares)	125,000,000	125,000,000
Common stock, issued shares (in shares)	31,987,000	32,020,000
Common stock, outstanding shares (in shares)	31,987,000	32,020,000