Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Jun. 30, 2011	Mar. 31, 2011
SHAREHOLDERS' EQUITY:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	160,000,000	160,000,000
Common stock, shares issued	107,183,675	105,771,507
Common stock, shares outstanding	96,957,371	95,702,299
Treasury stock, shares	10,226,304	10,069,208
Non-voting common stock
SHAREHOLDERS' EQUITY:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	450,000	450,000
Common stock, shares issued	382,632	382,632
Common stock, shares outstanding	382,632	382,632