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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, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Numerator
Net income	$ 107,209	$ 119,264	$ 112,560	$ 97,793	$ 95,709	$ 105,060	$ 107,720	$ 100,842	$ 436,826	$ 409,331	$ 446,163
Net income and dividends attributable to participating restricted shares									(3,517)	(3,592)	(4,597)
Numerator for basic earnings per common share									433,309	405,739	441,566
Undistributed income allocated to participating restricted shares									2,512	2,604	3,539
Undistributed income reallocated to participating restricted shares									(2,488)	(2,569)	(3,485)
Numerator for diluted earnings per common share									$ 433,333	$ 405,774	$ 441,620
Denominator
Weighted average number of shares outstanding - basic									146,017	149,168	154,423
Weighted average number of participating restricted shares									(1,176)	(1,309)	(1,591)
Weighted average number of common shares - basic									144,841	147,859	152,832
Effect of assumed conversion of 0.5% convertible notes										5	14
Effect of dilutive stock options granted									1,414	2,002	2,372
Weighted average number of common shares - diluted									146,255	149,866	155,218
Basic earnings per common share	$ 0.74	$ 0.82	$ 0.77	$ 0.67	$ 0.65	$ 0.71	$ 0.72	$ 0.67	$ 2.99	$ 2.74	$ 2.89
Diluted earnings per common share	$ 0.73	$ 0.81	$ 0.76	$ 0.66	$ 0.64	$ 0.70	$ 0.71	$ 0.66	$ 2.96	$ 2.71	$ 2.85

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Undistributed earnings (loss) reallocated to participating securities, diluted.

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

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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Number of shares of restricted stock determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Restricted shares are subject to sales, contractual, regulatory or other restrictions that prevent or inhibit the holder from freely disposing of them before the restriction ends.

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