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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Numerator
Numerator for basic and diluted earnings per share									$ 441,596	$ 422,122	$ 412,439
Denominator
Denominator for basic earnings per share - weighted average number of shares outstanding									152,832	159,012	161,330
Effect of assumed conversion of 0.50% convertible notes									14	20	24
Effect of dilutive stock options granted									2,372	2,334	1,764
Denominator for dilutive earnings per share - adjusted weighted average shares and assumed conversions									155,218	161,366	163,118
Basic earnings per share	$ 0.60	$ 0.70	$ 0.75	$ 0.84	$ 0.64	$ 0.69	$ 0.69	$ 0.64	$ 2.89	$ 2.65	$ 2.56
Diluted earnings per share	$ 0.59	$ 0.69	$ 0.74	$ 0.83	$ 0.63	$ 0.68	$ 0.68	$ 0.63	$ 2.85	$ 2.62	$ 2.53

X

- Definition

Adjusted net income (loss) for the purpose of earning per share computation.

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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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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.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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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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