Employee Benefit Plans (Tables)

9 Months Ended

Jun. 30, 2018

Retirement Benefits [Abstract]

Schedule of net benefit costs

Pension expense for the German and UK plans were as follows:

	Three Months Ended June 30,
	2017		2018
Service cost	$	267	$	230
Interest cost	82		116
Expected return on plan assets	(40)		(30)
Amortization of actuarial losses	188		75
Pension expense for defined benefit plans	$	497	$	391
	Nine Months Ended June 30,
	2017		2018
Service cost	$	802	$	705
Interest cost	246		357
Expected return on plan assets	(121)		(93)
Amortization of actuarial losses	563		230
Pension expense for defined benefit plans	$	1,490	$	1,199