Earnings per Share (Details) (USD $) In Thousands, except Share data	12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009
Earnings per Share
Net income per common share, basic, Net Income	$ 73,523	$ 48,812	$ 47,688
Net income per common share, basic, Shares	26,872,000	26,605,000	26,445,000
Net income per common share, basic, Per Share Amount	$ 2.74	$ 1.83	$ 1.80
Effect of dilutive stock options, Shares	374,000	264,000	143,000
Net income per common share, assuming dilution, Net Income	$ 73,523	$ 48,812	$ 47,688
Net income per common share, assuming dilution, Shares	27,246,000	26,869,000	26,588,000
Net income per common share, assuming dilution, Per Share Amount	$ 2.70	$ 1.82	$ 1.79
Weighted average shares excluded from the computation of diluted earnings per share	947,000	1,208,000	1,474,000