Earnings Per Share (Details)	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Earnings Per Share [Abstract]
Anti-dilutive are excluded from the Company's diluted earnings per share	1,700,000	1,500,000	1,800,000	1,300,000
Basic	75,940,000	84,057,000	76,632,000	83,739,000
Incremental shares from assumed exercises of stock options and options under the ESPP	1,765,000	1,793,000	1,708,000	1,810,000
Diluted	77,705,000	85,850,000	78,340,000	85,549,000