Employee Benefit Plans (Details Textuals 1) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Schedule of Deferred Compensation Arrangement with Individual, Postretirement Benefits [Table]
Officers' Compensation	$ 11,800,000	$ 9,800,000	$ 4,900,000
Employee Stock Purchase Plan [Abstract]
Discounted price for purchasing company's common stock	85.00%
Employee Stock Purchase Plan, Maximum Percent of Annual Compensation	15.00%
Annual limit on common stock purchases under the ESPP	25,000
Number of shares issued under employee benefit plans	77,216	63,105	79,455
Value of shares issued under employee benefit plans	1,400,000	1,100,000	900,000
401(k) plan [Member]
Schedule of Deferred Compensation Arrangement with Individual, Postretirement Benefits [Table]
401(k) expense	8,500,000	6,400,000	5,600,000
Supplemental executive retirement plan [Member]
Schedule of Deferred Compensation Arrangement with Individual, Postretirement Benefits [Table]
Deferred compensation liability	24,300,000	21,500,000
Deferred compensation expense	3,900,000	3,600,000	3,100,000
Deferred compensation plan for select group of employees [Member]
Schedule of Deferred Compensation Arrangement with Individual, Postretirement Benefits [Table]
Deferred compensation liability	39,700,000	22,900,000
Deferred compensation expense	$ 1,600,000	$ 600,000	$ 1,600,000