Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Numerator: Net income	$ 19,437	$ 17,642
Weighted-average shares outstanding, basic (in shares)	28,034,000	27,618,000
Denominator: Dilutive effect of share-based payments	223,000	283,000
Weighted-average shares outstanding, diluted (in shares)	28,257,000	27,901,000
Net income per common share, basic (in dollars per share)	$ 0.69	$ 0.64
Net income per common share, diluted (in dollars per share)	$ 0.69	$ 0.63
Weighted average shares excluded from the computation of diluted earnings per share	751,435	1,058,235