Common Stock and Stock Compensation - Stock Issued as Acquisition Consideration (Details) - Common Stock Class A Non-voting [Member] - shares shares in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Class of Stock [Line Items]
Shares issued due to acquisitions	1,168	0	1,965
Shares issued due to purchase of subsidiary shares from noncontrolling interest	0	0	592