Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 6,300	$ 6,273
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares outstanding	16,133,000	17,480,000
Common stock, shares issued	25,898,000	25,730,000
Treasury stock, shares	9,765,000	8,250,000