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Pension and Retirement Plans (Detail) - Changes of the benefit obligation, the plan assets and funded status of the plans - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 9,301  
Fair value of plan assets 7,629 $ 9,301
Net amount recognized 14,022 10,685
U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Net amount recognized 2,086 2,007
Foreign    
Defined Benefit Plan Disclosure [Line Items]    
Net amount recognized 11,936 8,678
Pension    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 35 56
Interest cost 614 686
Net amount recognized 12,765 9,700
Pension | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 0
Interest cost 43 52
Net amount recognized 829 1,022
Pension | Foreign    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 35 56
Interest cost 571 634
Net amount recognized 11,936 8,678
Post Retirement    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 27 34
Interest cost 42 44
Net amount recognized 1,257 985
Post Retirement | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 27 34
Interest cost 42 44
Net amount recognized 1,257 985
Post Retirement | Foreign    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 0
Interest cost 0 0
Net amount recognized 0 0
Change in projected benefit obligation (“PBO”) | Pension    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation 19,001 20,147
Service cost 35 56
Interest cost 614 687
Changes in actuarial assumptions 3,968 296
Foreign exchange impact (2,069) (1,534)
Benefits paid (1,156) (651)
Projected benefit obligation 20,393 19,001
Change in projected benefit obligation (“PBO”) | Pension | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation 1,022 1,228
Service cost 0 0
Interest cost 43 52
Changes in actuarial assumptions 20 (8)
Foreign exchange impact 0 0
Benefits paid (256) (250)
Projected benefit obligation 829 1,022
Change in projected benefit obligation (“PBO”) | Pension | Foreign    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation 17,979 18,919
Service cost 35 56
Interest cost 571 635
Changes in actuarial assumptions 3,948 304
Foreign exchange impact (2,069) (1,534)
Benefits paid (900) (401)
Projected benefit obligation 19,564 17,979
Change in projected benefit obligation (“PBO”) | Post Retirement    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation 985 1,045
Service cost 27 34
Interest cost 42 44
Changes in actuarial assumptions 203 (138)
Foreign exchange impact 0 0
Benefits paid 0 0
Projected benefit obligation 1,257 985
Change in projected benefit obligation (“PBO”) | Post Retirement | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation 985 1,045
Service cost 27 34
Interest cost 42 44
Changes in actuarial assumptions 203 (138)
Foreign exchange impact 0 0
Benefits paid 0 0
Projected benefit obligation 1,257 985
Change in projected benefit obligation (“PBO”) | Post Retirement | Foreign    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation 0 0
Service cost 0 0
Interest cost 0 0
Changes in actuarial assumptions 0 0
Foreign exchange impact 0 0
Benefits paid 0 0
Projected benefit obligation 0 0
Changes in fair value of plan assets:    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 9,301 10,094
Fair value of plan assets 7,629 9,301
Changes in fair value of plan assets: | Pension    
Defined Benefit Plan Disclosure [Line Items]    
Actual gain (loss) on plan assets 111 (117)
Company contributions 662 649
Foreign exchange impact (1,289) (673)
Benefits paid (1,156) (652)
Funded status (12,764) (9,700)
Net amount recognized (12,764) (9,700)
Changes in fair value of plan assets: | Pension | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Actual gain (loss) on plan assets 0 0
Company contributions 256 251
Foreign exchange impact 0 0
Benefits paid (256) (251)
Fair value of plan assets 0 0
Funded status (829) (1,022)
Net amount recognized (829) (1,022)
Changes in fair value of plan assets: | Pension | Foreign    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 9,301 10,094
Actual gain (loss) on plan assets 111 (117)
Company contributions 406 398
Foreign exchange impact (1,289) (673)
Benefits paid (900) (401)
Fair value of plan assets 7,629 9,301
Funded status (11,935) (8,678)
Net amount recognized (11,935) (8,678)
Changes in fair value of plan assets: | Post Retirement    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Actual gain (loss) on plan assets 0 0
Company contributions 0 0
Foreign exchange impact 0 0
Benefits paid 0 0
Fair value of plan assets 0 0
Funded status (1,257) (985)
Net amount recognized (1,257) (985)
Changes in fair value of plan assets: | Post Retirement | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Actual gain (loss) on plan assets 0 0
Company contributions 0 0
Foreign exchange impact 0 0
Benefits paid 0 0
Fair value of plan assets 0 0
Funded status (1,257) (985)
Net amount recognized (1,257) (985)
Changes in fair value of plan assets: | Post Retirement | Foreign    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Actual gain (loss) on plan assets 0 0
Company contributions 0 0
Foreign exchange impact 0 0
Benefits paid 0 0
Fair value of plan assets 0 0
Funded status 0 0
Net amount recognized $ 0 $ 0