Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Mar. 31, 2014
Statement of Financial Position [Abstract]
Trade accounts receivable, allowances (in dollars)	$ 19,613	$ 15,569
Property and equipment, accumulated deprecation	116,648	103,090
Other intangible assets, accumulated amortization	$ 32,457	$ 26,026
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares	125,000	125,000
Common stock, issued shares	34,636	34,624
Common stock, outstanding shares	34,636	34,624