Common Stock, Options, and Stock Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Gross compensation costs:
Total gross compensation costs	$ 7,341	$ 7,314	$ 6,714
Income tax benefits:
Total income tax benefits	(3,576)	(2,460)	(2,203)
Net compensation expense	3,765	4,854	4,511
Stock Options [Member]
Income tax benefits:
Total income tax benefits	0	0	(39)
Restricted Stock [Member]
Gross compensation costs:
Total gross compensation costs	7,341	7,314	6,714
Income tax benefits:
Total income tax benefits	$ (3,576)	$ (2,460)	$ (2,164)
Common Class A [Member]
Information on Class A Common Stock issued as acquisition
Shares issued due to acquisitions	0	1,965,000	635,000
Shares issued due to purchase of subsidiary shares from noncontrolling interest	0	592,000	0