Pension and Retirement Plans (Detail) - Amounts recognized in the consolidated balance sheet (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
Accrued benefit liability	$ 9,406	$ 10,148
Deferred tax	80	42
Accumulated other comprehensive income	3,710	4,339
Net amount recognized	(5,616)	(5,767)
Accumulated benefit obligation	(18,769)	(18,956)
Foreign
Defined Benefit Plan Disclosure [Line Items]
Accrued benefit liability	7,178	7,661
Deferred tax	(188)	(233)
Accumulated other comprehensive income	3,895	4,540
Net amount recognized	(3,471)	(3,354)
Accumulated benefit obligation	(16,541)	(16,469)
U.S.
Defined Benefit Plan Disclosure [Line Items]
Accrued benefit liability	2,228	2,487
Deferred tax	268	275
Accumulated other comprehensive income	(185)	(201)
Net amount recognized	(2,145)	(2,413)
Accumulated benefit obligation	(2,228)	(2,487)
Pension
Defined Benefit Plan Disclosure [Line Items]
Accrued benefit liability	8,549	9,266
Deferred tax	(159)	(227)
Accumulated other comprehensive income	3,896	4,622
Net amount recognized	(4,812)	(4,871)
Accumulated benefit obligation	(17,912)	(18,074)
Pension | Foreign
Defined Benefit Plan Disclosure [Line Items]
Accrued benefit liability	7,178	7,661
Deferred tax	(188)	(233)
Accumulated other comprehensive income	3,895	4,540
Net amount recognized	(3,471)	(3,354)
Accumulated benefit obligation	(16,541)	(16,469)
Pension | U.S.
Defined Benefit Plan Disclosure [Line Items]
Accrued benefit liability	1,371	1,605
Deferred tax	29	6
Accumulated other comprehensive income	1	82
Net amount recognized	(1,341)	(1,517)
Accumulated benefit obligation	(1,371)	(1,605)
Post Retirement
Defined Benefit Plan Disclosure [Line Items]
Accrued benefit liability	857	882
Deferred tax	239	269
Accumulated other comprehensive income	(186)	(283)
Net amount recognized	(804)	(896)
Accumulated benefit obligation	(857)	(882)
Post Retirement | Foreign
Defined Benefit Plan Disclosure [Line Items]
Accrued benefit liability	0	0
Deferred tax	0	0
Accumulated other comprehensive income	0	0
Net amount recognized	0	0
Accumulated benefit obligation	0	0
Post Retirement | U.S.
Defined Benefit Plan Disclosure [Line Items]
Accrued benefit liability	857	882
Deferred tax	239	269
Accumulated other comprehensive income	(186)	(283)
Net amount recognized	(804)	(896)
Accumulated benefit obligation	$ (857)	$ (882)