Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Jun. 30, 2015	Mar. 31, 2015
Statement of Financial Position [Abstract]
Trade accounts receivable, net of allowances ($18,762 at June 30, 2015 and $18,218 at March 31, 2015)	$ 18,762	$ 18,218
Property and equipment, net of accumulated depreciation ($137,766 at June 30, 2015 and $129,002 at March 31, 2015)	137,766	129,002
Other intangible assets, net of accumulated amortization ($39,254 at June 30, 2015 and $37,316 at March 31, 2015)	$ 39,254	$ 37,316
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares	125,000	125,000
Common stock, issued shares	32,678	33,292
Common stock, outstanding shares	32,678	33,292