Stock-Based Compensation (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended		0 Months Ended	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Nov. 25, 2014	Mar. 31, 2015	Mar. 31, 2014
Fair value assumptions
Stock-based employee compensation expense	$ 262	$ 233
Original option plan August 2004
Information relating to stock options
Number of shares of common stock reserved for issuance	1,000,000			1,000,000
Second option plan January 2007
Information relating to stock options
Number of shares of common stock reserved for issuance	500,000			500,000
Stock Option Plans
Information relating to stock options
Number of plans	2
Number of shares of common stock reserved for issuance	1,500,000			1,500,000
Period during which options are exercisable	10 years
Vesting of awards per year (as a percent)	33.33%
Award vesting period	3 years
Fair value assumptions
Fair Value (in dollars per share)			$ 8.17
Dividend Yield (as a percent)			1.90%
Risk-Free Interest Rate (as a percent)			0.96%
Expected Volatility (as a percent)			28.00%
Expected Life			3 years
Stock-based employee compensation expense				136	121
Remaining unrecognized compensation expense	950			950
Weighted average period for recognition	1 year 4 months 2 days
Activity under stock option plans, number of shares
Outstanding at beginning of the period (in shares)	282,001
Granted (in shares)	81,100
Exercised (in shares)	0
Outstanding at end of the period (in shares)	363,101			363,101
Vested or expected to vest (in shares)	342,016			342,016
Exercisable at end of period (in shares)	239,367			239,367
Outstanding at end of period, Aggregate Intrinsic Value	677			677
Vested or expected to vest, Aggregate Intrinsic Value	665			665
Exercisable at end of the period, Aggregate Intrinsic Value	$ 677			$ 677
Weighted Average Exercise Prices
Outstanding at beginning of the period (in dollars per share)	$ 51.61
Granted (in dollars per share)	$ 46.72
Outstanding at end of period (in dollars per share)	$ 50.52			$ 50.52
Vested or expected to vest (in dollars per share)	$ 50.66			$ 50.66
Exercisable at end of the period (in dollars per share)	$ 51.66			$ 51.66
Outstanding at end of the period, Weighted Average Remaining Contractual Life	5 years 11 months 12 days
Vested or expected to vest, Weighted Average Remaining Contractual Life	5 years 9 months 22 days
Exercisable at end of the period, Weighted Average Remaining Contractual Life	4 years 3 months 4 days
Stock Option Plans | Certain Employees
Activity under stock option plans, number of shares
Granted (in shares)			81,100
Weighted Average Exercise Prices
Granted (in dollars per share)			$ 46.72