CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Mar. 31, 2019
Statement of Financial Position [Abstract]
Trade accounts receivable, allowances	$ 26,438	$ 18,824
Inventory reserves	13,152	9,723
Accumulated depreciation	241,461	235,939
Accumulated amortization	$ 74,025	$ 71,186
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)	27,982,000	29,141,000
Common stock, outstanding shares (in shares)	27,982,000	29,141,000