Pension and Retirement Plans (Detail) - Components of net periodic benefit costs - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Pension:
Pension:
Interest cost	$ 100	$ 92	$ 300	$ 269
Expected return on plan assets	(77)	(68)	(231)	(198)
Amortization of:
Amortization of net gain (loss)	44	51	132	150
Net periodic benefit cost from continuing operations	119	143	359	421
Post Retirement:
Pension:
Service cost	10	10	32	29
Interest cost	12	10	35	33
Amortization of:
Amortization of net gain (loss)	(4)	4	(14)	11
Net periodic benefit cost from continuing operations	18	24	53	73
Foreign | Pension:
Pension:
Interest cost	93	81	280	237
Expected return on plan assets	(77)	(68)	(231)	(198)
Amortization of:
Amortization of net gain (loss)	45	52	133	153
Net periodic benefit cost from continuing operations	113	133	340	392
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 from continuing operations	0	0	0	0
U.S. | Pension:
Pension:
Interest cost	7	11	20	32
Expected return on plan assets	0	0	0	0
Amortization of:
Amortization of net gain (loss)	(1)	(1)	(1)	(3)
Net periodic benefit cost from continuing operations	6	10	19	29
U.S. | Post Retirement:
Pension:
Service cost	10	10	32	29
Interest cost	12	10	35	33
Amortization of:
Amortization of net gain (loss)	(4)	4	(14)	11
Net periodic benefit cost from continuing operations	18	24	53	73
Continuing Operations | Pension:
Amortization of:
Net periodic benefit cost from continuing operations	67	75	201	221
Continuing Operations | Foreign | Pension:
Amortization of:
Net periodic benefit cost from continuing operations	61	65	182	192
Continuing Operations | U.S. | Pension:
Amortization of:
Net periodic benefit cost from continuing operations	6	10	19	29
Discontinued Operations | Pension:
Amortization of:
Net periodic benefit cost from continuing operations	52	68	158	200
Discontinued Operations | Foreign | Pension:
Amortization of:
Net periodic benefit cost from continuing operations	52	68	158	200
Discontinued Operations | U.S. | Pension:
Amortization of:
Net periodic benefit cost from continuing operations	$ 0	$ 0	$ 0	$ 0