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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, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Numerator
Net income	$ 95,709	$ 105,060	$ 107,720	$ 100,842	$ 91,130	$ 107,782	$ 116,261	$ 130,990	$ 409,331	$ 446,163	$ 422,122
Less-net income and dividends attributable to participating restricted shares									(3,592)	(4,597)	(4,837)
Numerator for basic earnings per common share									405,739	441,566	417,285
Add-undistributed income allocated to participating restricted shares									2,604	3,539	3,753
Less-undistributed income reallocated to participating restricted shares									(2,569)	(3,485)	(3,698)
Numerator for diluted earnings per common share									$ 405,774	$ 441,620	$ 417,340
Denominator
Weighted average number of shares outstanding - basic									149,168	154,423	159,012
Less-weighted average number of participating restricted shares									(1,309)	(1,591)	(1,822)
Weighted average number of common shares - basic									147,859	152,832	157,190
Effect of assumed conversion of 0.5% convertible notes									5	14	20
Effect of dilutive stock options granted									2,002	2,372	2,334
Weighted average number of common shares - diluted									149,866	155,218	159,544
Basic earnings per common share	$ 0.65	$ 0.71	$ 0.72	$ 0.67	$ 0.60	$ 0.70	$ 0.75	$ 0.84	$ 2.74	$ 2.89	$ 2.65
Diluted earnings per common share	$ 0.64	$ 0.70	$ 0.71	$ 0.66	$ 0.59	$ 0.69	$ 0.74	$ 0.83	$ 2.71	$ 2.85	$ 2.62

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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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Amount of earnings (loss) distributed and earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

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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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