Pension and Retirement Plans (Detail) - Components of net periodic benefit costs - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Pension:
Pension:
Service cost	$ 10	$ 10
Interest cost	123	104
Expected return on plan assets	(75)	(65)
Amortization of:
Amortization of net gain (loss)	59	90
Net periodic benefit cost	117	139
Post Retirement:
Pension:
Service cost	10	10
Interest cost	12	10
Amortization of:
Amortization of net gain (loss)	(4)	4
Net periodic benefit cost	18	24
Foreign | Pension:
Pension:
Service cost	10	10
Interest cost	116	93
Expected return on plan assets	(75)	(65)
Amortization of:
Amortization of net gain (loss)	60	91
Net periodic benefit cost	111	129
Foreign | Post Retirement:
Pension:
Service cost	0	0
Interest cost	0	0
Amortization of:
Amortization of net gain (loss)	0	0
Net periodic benefit cost	0	0
U.S. | Pension:
Pension:
Service cost	0	0
Interest cost	7	11
Expected return on plan assets	0	0
Amortization of:
Amortization of net gain (loss)	(1)	(1)
Net periodic benefit cost	6	10
U.S. | Post Retirement:
Pension:
Service cost	10	10
Interest cost	12	10
Amortization of:
Amortization of net gain (loss)	(4)	4
Net periodic benefit cost	$ 18	$ 24