Equity (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended	1 Months Ended			0 Months Ended
	Apr. 30, 2015	Jan. 31, 2015	Nov. 30, 2014	Jun. 30, 2015	Mar. 11, 2015
Equity (Textual)
Dividends paid	$ 43.2
Common stock dividends declared	$ 1.85
Shares contributed cost by company	1.3
Board of Directors [Member]
Equity (Textual)
Common stock dividends declared		$ 0.64	$ 0.68
Class A common stock [Member]
Equity (Textual)
Dividends paid
Class A common stock [Member] | Subsequent Event [Member]
Equity (Textual)
Dividend per share declared				$ 0.18
Date of declared dividend to be paid				Jun. 23, 2015
Record date of declared dividend				Jun. 15, 2015
Class B common stock [Member]
Equity (Textual)
Dividends paid
Shares contributed cost by company	70,843
Class B common stock shares repurchased	29,675
Aggregate purchase price of shares repurchased	0.4
Stock repurchase program, remaining number of shares authorized to be repurchased	5,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					300,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights					The shares vest 50% in January 2017 and 50% in July 2018.
Unrecognized compensation expense related to restricted shares					$ 5.0
Class B common stock [Member] | Stock Repurchase Program [Member]
Equity (Textual)
Stock repurchase program, shares authorized for repurchase	8,300,000
Class B common stock [Member] | Subsequent Event [Member]
Equity (Textual)
Dividend per share declared				$ 0.18
Date of declared dividend to be paid				Jun. 23, 2015
Record date of declared dividend				Jun. 15, 2015