Summary Of Significant Accounting Policies (Earnings Per Share Basic And Diluted) (Details) (USD $) In Thousands, except Per Share data	12 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Summary Of Significant Accounting Policies [Abstract]
Net income	$ 85,424	$ 24,368	$ 31,522
Weighted average shares outstanding	117,579	115,639	114,950
Dilutive effect of employee stock options, restricted shares and restricted stock units	3,395	4,286	2,409
Diluted weighted average shares outstanding	120,974	119,925	117,359
Basic earnings per share	$ 0.73	$ 0.21	$ 0.27
Diluted earnings per share	$ 0.71	$ 0.20	$ 0.27

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

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-Topic 260

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-URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256

+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph A7

-Appendix A

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Reference 9: http://www.xbrl.org/2003/role/presentationRef

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-Glossary Other Comprehensive Income

-URI http://asc.fasb.org/extlink&oid=6519514

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-Publisher AICPA

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-Number 87-21

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Reference 12: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Net Income

-URI http://asc.fasb.org/extlink&oid=6518256

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

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-Number 210

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-Section 03

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-Number 210

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-Article 9

+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References+ Details

- Definition

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

+ References

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

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+ Details