Employee Benefit Plans - Summary of the Components of Net Periodic Benefit Cost (Details) - Pension Plan - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Net periodic benefit cost
Service cost	$ 12	$ 0
Interest cost	56	0
Expected return on plan assets	(64)	0
Amortization of prior losses	62	0
Net periodic benefit cost	$ 66	$ 0