CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012
Current assets [Abstract]
Allowance for doubtful accounts	$ 940	$ 809
Shareholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.025	$ 0.025
Preferred stock, shares authorized (in shares)	16,000	16,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.625	$ 0.625
Common stock, shares authorized (in shares)	80,000	80,000
Common stock, shares issued (in shares)	47,714	47,361
Treasury stock at cost: shares (in shares)	611	594