Incentive Compensation (Details) $ in Thousands	1 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($) shares	Sep. 30, 2015 USD ($) shares	Jul. 31, 2016 USD ($) Director shares	Jul. 31, 2015 USD ($) shares	Jul. 31, 2014 USD ($)	Oct. 31, 2016 shares
Class of Stock [Line Items]
Incentive compensation expense			$ 37	$ 59	$ 353
Term of the award plan			5 years
Share-based award, vesting period			1 year
Excess tax benefits accumulated in capital in excess of par value			$ 0	100
Maximum [Member]
Class of Stock [Line Items]
Compensation expense			100	100	400
Class A [Member]
Class of Stock [Line Items]
Incentive compensation expense			$ 1,700	$ 3,000	$ 1,400
Shares awarded (in shares) | shares			17,386
Shares authorized (in shares) | shares			6,000,000	6,000,000
Class A [Member] | Directors Chairman [Member]
Class of Stock [Line Items]
Shares awarded (in shares) | shares		4,533
Number of directors | Director			3
Class A [Member] | Directors Chairman [Member] | Subsequent Event [Member]
Class of Stock [Line Items]
Shares awarded (in shares) | shares	4,450
Shares authorized (in shares) | shares						200,000
Class A [Member] | Maximum [Member] | Directors Chairman [Member]
Class of Stock [Line Items]
Shares awarded, value		$ 100
Class A [Member] | Maximum [Member] | Directors Chairman [Member] | Subsequent Event [Member]
Class of Stock [Line Items]
Shares awarded, value	$ 100