CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - $ / shares	Sep. 30, 2019	Sep. 30, 2018
STOCKHOLDERS’ EQUITY
Preferred stock, shares authorized (in shares)	3,000,000	3,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	90,000,000	90,000,000
Common stock, shares issued (in shares)	37,821,508	39,192,063
Common stock, shares outstanding (in shares)	37,807,064	39,167,280
Treasury stock (in shares)	14,444	24,783
Nonvoting Common Stock
STOCKHOLDERS’ EQUITY
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	3,000,000	3,000,000
Common stock, shares issued (in shares)	0	0
Common stock, shares outstanding (in shares)	0	0