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Earnings Per Share (Details)	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share
Denominator for basic earnings per share (in shares)	100,430,000	113,352,000	102,791,000	113,659,000
Potential common shares (in shares)	1,400,000	900,000	1,100,000	700,000
Denominator for diluted earnings per share (in shares)	101,818,000	114,288,000	103,875,000	114,439,000

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

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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.

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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.

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