Shareholders' Equity (Details 1) (USD $) In Thousands, except Per Share data	12 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009
Computation of basic and diluted earnings per share
Net income	$ 96,759	$ 65,903	$ 42,260
Average Shares Outstanding:
Weighted-average common shares outstanding for basic computation	42,433	42,312	42,287
Dilutive effect of potential common shares	821	549	507
Weighted-average common shares outstanding for dilutive computation	43,254	42,861	42,794
Net Income Per Share - Basic	$ 2.28	$ 1.56	$ 1.00
Net Income Per Share - Diluted	$ 2.24	$ 1.54	$ 0.99

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The amount of net income or loss for the period per each share of common stock outstanding during the reporting period.

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The amount of net income or loss for the period per each share of common stock and dilutive common stock equivalents outstanding during the reporting period.

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The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.

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The sum of dilutive potential common shares used in the calculation of the diluted per-share computation.

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The average number of shares issued and outstanding that are used in calculating diluted EPS, determined based on the timing of issuance of shares in the period.

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Number of [basic] shares, after adjustment for contingently issuable shares and other shares not deemed outstanding, determined by relating the portion of time within a reporting period that common shares have been outstanding to the total time in that period.

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