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Pension and Retirement Plans (Detail) - Amounts recognized in the consolidated balance sheet - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
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Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | $ (12,352) | $ (14,022)
Deferred tax | (383) | (150)
Accumulated other comprehensive income | 6,949 | 9,124
Net amount recognized | (5,786) | (5,048)
Accumulated benefit obligation | (20,446) | (21,482)
Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (11,097) | (12,765)
Deferred tax | (474) | (202)
Accumulated other comprehensive income | 6,911 | 9,027
Net amount recognized | (4,660) | (3,940)
Accumulated benefit obligation | (19,191) | (20,225)
Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (1,255) | (1,257)
Deferred tax | 91 | 52
Accumulated other comprehensive income | 38 | 97
Net amount recognized | (1,126) | (1,108)
Accumulated benefit obligation | (1,255) | (1,257)
International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (10,420) | (11,936)
Deferred tax | (493) | (216)
Accumulated other comprehensive income | 6,893 | 9,001
Net amount recognized | (4,020) | (3,151)
Accumulated benefit obligation | (18,514) | (19,396)
International | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (10,420) | (11,936)
Deferred tax | (493) | (216)
Accumulated other comprehensive income | 6,893 | 9,001
Net amount recognized | (4,020) | (3,151)
Accumulated benefit obligation | (18,514) | (19,396)
International | Post Retirement |  |
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
Domestic |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (1,932) | (2,086)
Deferred tax | 110 | 66
Accumulated other comprehensive income | 56 | 123
Net amount recognized | (1,766) | (1,897)
Accumulated benefit obligation | (1,932) | (2,086)
Domestic | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (677) | (829)
Deferred tax | 19 | 14
Accumulated other comprehensive income | 18 | 26
Net amount recognized | (640) | (789)
Accumulated benefit obligation | (677) | (829)
Domestic | Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (1,255) | (1,257)
Deferred tax | 91 | 52
Accumulated other comprehensive income | 38 | 97
Net amount recognized | (1,126) | (1,108)
Accumulated benefit obligation | $ (1,255) | $ (1,257)

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