Pension and Retirement Plans (Detail) - Components of net periodic benefit costs (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Pension:
Pension:
Service cost	$ 13	$ 12	$ 28	$ 23
Interest cost	168	210	346	417
Expected return on plan assets	(104)	(117)	(212)	(232)
Amortization of:
Prior service gain	0	0	0	0
Amortization of net gain	48	21	100	42
Net periodic benefit cost	125	126	262	250
Post Retirement:
Pension:
Service cost	9	2	17	5
Interest cost	11	11	22	22
Amortization of:
Amortization of net gain	(13)	(36)	(25)	(72)
Net periodic benefit cost	7	(23)	14	(45)
Foreign | Pension:
Pension:
Service cost	13	12	28	23
Interest cost	155	193	320	383
Expected return on plan assets	(104)	(117)	(212)	(232)
Amortization of:
Prior service gain	0	0	0	0
Amortization of net gain	49	23	102	46
Net periodic benefit cost	113	111	238	220
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	13	17	26	34
Expected return on plan assets	0	0	0	0
Amortization of:
Prior service gain	0	0	0	0
Amortization of net gain	(1)	(2)	(2)	(4)
Net periodic benefit cost	12	15	24	30
U.S. | Post Retirement:
Pension:
Service cost	9	2	17	5
Interest cost	11	11	22	22
Amortization of:
Amortization of net gain	(13)	(36)	(25)	(72)
Net periodic benefit cost	$ 7	$ (23)	$ 14	$ (45)