Stock-based Compensation (Details 3) (Stock Option Plans, USD $)	12 Months Ended
	Sep. 30, 2013
Stock-based Compensation
Outstanding Number of Shares	291,664
Exercisable Number of Shares	233,962
Exercise Price Per Share $12.80
Stock-based Compensation
Exercise Price Per Share (in dollars per share)	$ 12.80
Remaining Contractual Life	11 months 1 day
Outstanding Number of Shares	32,207
Exercisable Number of Shares	32,207
Exercise Price Per Share $31.00
Stock-based Compensation
Exercise Price Per Share (in dollars per share)	$ 31.00
Remaining Contractual Life	2 years 6 months
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	3 years 6 months
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	4 years 6 months
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	5 years
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	5 years 6 months
Outstanding Number of Shares	20,089
Exercisable Number of Shares	20,089
Exercise Price Per Share $34.00
Stock-based Compensation
Exercise Price Per Share (in dollars per share)	$ 34.00
Remaining Contractual Life	6 years 3 months
Outstanding Number of Shares	25,801
Exercisable Number of Shares	25,801
Exercise Price Per Share $40.26
Stock-based Compensation
Exercise Price Per Share (in dollars per share)	$ 40.26
Remaining Contractual Life	7 years 2 months 1 day
Outstanding Number of Shares	20,967
Exercisable Number of Shares	13,800
Exercise Price Per Share $55.88
Stock-based Compensation
Exercise Price Per Share (in dollars per share)	$ 55.88
Remaining Contractual Life	8 years 2 months 1 day
Outstanding Number of Shares	19,700
Exercisable Number of Shares	6,565
Exercise Price Per Share $47.96
Stock-based Compensation
Exercise Price Per Share (in dollars per share)	$ 47.96
Remaining Contractual Life	9 years 2 months 1 day
Outstanding Number of Shares	35,600
Exercise Price Per Share $48.39
Stock-based Compensation
Exercise Price Per Share (in dollars per share)	$ 48.39
Remaining Contractual Life	9 years 2 months 1 day
Outstanding Number of Shares	1,800