Share Based Compensation-Stock Option Rollforward (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Sep. 30, 2012
Shares
Outstanding Shares at beginning of period		46,665
Outstanding Shares, Granted	0
Outstanding Shares, Vested	0
Outstanding Shares, Exercised	(27,999)
Outstanding Shares, Forfeited or expired	0
Outstanding Shares at end of period	18,666	46,665
Exercisable Shares at beginning of period		9,333
Exercisable Shares, Granted	0
Exercisable Shares, Vested	37,332
Exercisable Shares, Exercised	(27,999)
Exercisable Shares at end of period	18,666	9,333
Weighted-Average Exercise Price
Outstanding Weighted Average Exercise Price, Outstanding at beginning of period (usd per share)		$ 19.01
Outstanding Weighted-Average Exercise Price, Granted (usd per share)	$ 0.00
Outstanding Weighted-Average Exercise Price, Vested (usd per share)	$ 0.00
Outstanding Weighted-Average Exercise Price, Exercised (usd per share)	$ 18.41
Outstanding Weighted-Average Exercise Price, Forfeited or expired (usd per share)	$ 0.00
Outstanding Weighted Average Exercise Price, Outstanding at end of period (usd per share)	$ 19.90	$ 19.01
Exercisable Weighted Average Exercise Price, Outstanding at beginning of period (usd per share)		$ 15.43
Exercisable Weighted Average Exercise Price, Granted (usd per share)	$ 0.00
Exercisable Weighted Average Exercise Price, Vested (usd per share)	$ 19.90
Exercisable Weighted Average Exercise Price, Exercised (usd per share)	$ 18.41
Exercisable Weighted Average Exercise Price, Outstanding at end of period (usd per share)	$ 19.90	$ 15.43
Aggregate Intrinsic Value
Outstanding, Aggregate Intrinsic Value, Outstanding at beginning of year		$ 1,547
Outstanding, Aggregate Intrinsic Value, Outstanding at end of year	665	1,547
Exercisable, Aggregate Intrinsic Value, Outstanding at beginning of year		320
Exercisable, Aggregate Intrinsic Value, Outstanding at end of year	$ 665	$ 320
Share Based Compensation Arrangement By Share Based Payment Award Options, Exerciseable Forfeited or Expired during period	0
Share Based Compensation Arrangement By Share Based Payment Award Options Forfeited or Expired In Period Exercisable Weighted Average Exercise Price	$ 0.00