Pension and Retirement Plans (Detail) - Components of net periodic benefit costs - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Pension:
Pension:
Service cost	$ 9	$ 13	$ 18	$ 28
Interest cost	157	168	319	346
Expected return on plan assets	(92)	(104)	(190)	(212)
Amortization of:
Prior service gain	0	0	0	0
Amortization of net gain	43	48	87	100
Net periodic benefit cost	117	125	234	262
Post Retirement:
Pension:
Service cost	7	9	14	17
Interest cost	11	11	21	22
Amortization of:
Amortization of net gain	(20)	(13)	(40)	(25)
Net periodic benefit cost	(2)	7	(5)	14
Foreign | Pension:
Pension:
Service cost	9	13	18	28
Interest cost	146	155	297	320
Expected return on plan assets	(92)	(104)	(190)	(212)
Amortization of:
Prior service gain	0	0	0	0
Amortization of net gain	44	49	89	102
Net periodic benefit cost	107	113	214	238
Foreign | Post Retirement:
Pension:
Service cost	0	0	0	0
Interest cost	0	0	0	0
Amortization of:
Amortization of net gain	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	13	22	26
Expected return on plan assets	0	0	0	0
Amortization of:
Prior service gain	0	0	0	0
Amortization of net gain	(1)	(1)	(2)	(2)
Net periodic benefit cost	10	12	20	24
U.S. | Post Retirement:
Pension:
Service cost	7	9	14	17
Interest cost	11	11	21	22
Amortization of:
Amortization of net gain	(20)	(13)	(40)	(25)
Net periodic benefit cost	$ (2)	$ 7	$ (5)	$ 14