Pension and Retirement Plans (Detail) - Components of net periodic benefit costs - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Pension:
Pension:
Service cost	$ 10	$ 9	$ 29	$ 27
Interest cost	108	157	317	474
Expected return on plan assets	(68)	(92)	(198)	(281)
Amortization of:
Prior service gain	0	0	0	0
Amortization of net gain (loss)	93	43	273	131
Net periodic benefit cost	143	117	421	351
Post Retirement:
Pension:
Service cost	10	7	29	20
Interest cost	10	11	33	32
Amortization of:
Amortization of net gain (loss)	4	(21)	11	(60)
Net periodic benefit cost	24	(3)	73	(8)
Foreign | Pension:
Pension:
Service cost	10	9	29	27
Interest cost	97	146	285	442
Expected return on plan assets	(68)	(92)	(198)	(281)
Amortization of:
Prior service gain	0	0	0	0
Amortization of net gain (loss)	94	44	276	134
Net periodic benefit cost	133	107	392	322
Foreign | Post Retirement:
Pension:
Service cost	0	0	0	0
Interest cost	0	0	0	0
Amortization of:
Amortization of net gain (loss)	0	0	0	0
Net periodic benefit cost	0	0	0	0
U.S. | Pension:
Pension:
Service cost	0	0	0	0
Interest cost	11	11	32	32
Expected return on plan assets	0	0	0	0
Amortization of:
Prior service gain	0	0	0	0
Amortization of net gain (loss)	(1)	(1)	(3)	(3)
Net periodic benefit cost	10	10	29	29
U.S. | Post Retirement:
Pension:
Service cost	10	7	29	20
Interest cost	10	11	33	32
Amortization of:
Amortization of net gain (loss)	4	(21)	11	(60)
Net periodic benefit cost	$ 24	$ (3)	$ 73	$ (8)