Defined Benefit Retirement Plan (Details) - USD ($)	3 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 500,000	$ 1,000,000
Service cost		255,000	$ 251,000
Interest cost		263,000	289,000
Expected return on plan assets		(406,000)	(409,000)
Amortization of unrecognized net loss		237,000	94,000
Amortization of prior service cost		(21,000)	(22,000)
Net periodic benefit cost		$ 328,000	$ 203,000