Stock-Based Compensation (Details 3) (Stock Option Plans, USD $)	6 Months Ended
	Mar. 31, 2015
Stock-Based Compensation
Outstanding Number of Shares	363,101
Exercisable Number of Shares	239,367
Exercise Price Per Share $31.00
Stock-Based Compensation
Exercise Price Per Share (in dollars per share)	$ 31.00
Remaining Contractual Life	1 year
Outstanding Number of Shares	10,000
Exercisable Number of Shares	10,000
Exercise Price Per Share $72.93
Stock-Based Compensation
Exercise Price Per Share (in dollars per share)	$ 72.93
Remaining Contractual Life	2 years
Outstanding Number of Shares	47,500
Exercisable Number of Shares	47,500
Exercise Price Per Share $54.00
Stock-Based Compensation
Exercise Price Per Share (in dollars per share)	$ 54.00
Remaining Contractual Life	3 years
Outstanding Number of Shares	58,000
Exercisable Number of Shares	58,000
Exercise Price Per Share $46.83
Stock-Based Compensation
Exercise Price Per Share (in dollars per share)	$ 46.83
Remaining Contractual Life	3 years 6 months
Outstanding Number of Shares	20,000
Exercisable Number of Shares	20,000
Exercise Price Per Share $17.82
Stock-Based Compensation
Exercise Price Per Share (in dollars per share)	$ 17.82
Remaining Contractual Life	4 years
Outstanding Number of Shares	12,084
Exercisable Number of Shares	12,084
Exercise Price Per Share $34.00
Stock-Based Compensation
Exercise Price Per Share (in dollars per share)	$ 34.00
Remaining Contractual Life	4 years 9 months
Outstanding Number of Shares	12,400
Exercisable Number of Shares	12,400
Exercise Price Per Share $40.26
Stock-Based Compensation
Exercise Price Per Share (in dollars per share)	$ 40.26
Remaining Contractual Life	5 years 8 months 1 day
Outstanding Number of Shares	19,667
Exercisable Number of Shares	19,667
Exercise Price Per Share $55.88
Stock-Based Compensation
Exercise Price Per Share (in dollars per share)	$ 55.88
Remaining Contractual Life	6 years 8 months 1 day
Outstanding Number of Shares	19,700
Exercisable Number of Shares	19,700
Exercise Price Per Share $47.96
Stock-Based Compensation
Exercise Price Per Share (in dollars per share)	$ 47.96
Remaining Contractual Life	7 years 8 months 1 day
Outstanding Number of Shares	35,600
Exercisable Number of Shares	23,734
Exercise Price Per Share $48.39
Stock-Based Compensation
Exercise Price Per Share (in dollars per share)	$ 48.39
Remaining Contractual Life	7 years 8 months 1 day
Outstanding Number of Shares	1,800
Exercisable Number of Shares	1,200
Exercise Price Per Share $52.78
Stock-Based Compensation
Exercise Price Per Share (in dollars per share)	$ 52.78
Remaining Contractual Life	8 years 8 months 1 day
Outstanding Number of Shares	45,250
Exercisable Number of Shares	15,082
Exercise Price Per Share $46.72
Stock-Based Compensation
Exercise Price Per Share (in dollars per share)	$ 46.72
Remaining Contractual Life	9 years 8 months 1 day
Outstanding Number of Shares	81,100