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CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Statement of Financial Position [Abstract]
Allowance for loan losses	$ 133,086	$ 129,257
Goodwill	$ 301,368	$ 301,368
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	135,506,620	135,343,417
Common stock, shares outstanding (in shares)	80,435,217	82,710,911
Treasury stock, shares (in shares)	55,071,403	52,632,506

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Face amount or stated value per share of common stock.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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