Earnings Per Share (Details) (USD $) In Thousands, except Per Share data	3 Months Ended	12 Months Ended
Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009	Sep. 30, 2009	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009
Reconciliation of basic average common shares outstanding to diluted average common shares outstanding
Net income (loss)	$ 77,276	$ 68,145	$ 78,283	$ 75,104	$ 39,779	$ 38,447	$ 13,840	$ (15,136)	$ 298,808	$ 76,930	$ (322,036)
Basic average common shares outstanding									174,812	173,803	174,598
Effect of dilutive stock options									1,131	857
Diluted average common shares outstanding									175,943	174,660	174,598
Earnings (loss) per share:
Basic	$ 0.44	$ 0.39	$ 0.45	$ 0.43	$ 0.23	$ 0.22	$ 0.08	$ (0.09)	$ 1.71	$ 0.44	$ (1.84)
Diluted	$ 0.44	$ 0.39	$ 0.45	$ 0.43	$ 0.23	$ 0.22	$ 0.08	$ (0.09)	$ 1.70	$ 0.44	$ (1.84)

Earning Per Share.

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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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