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Pension and Retirement Plans (Detail) - Amounts recognized in the consolidated balance sheet - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | $ (6,508) | $ (6,978)
Deferred tax | 114 | 110
Accumulated other comprehensive income | 5,298 | 5,769
Net amount recognized | (1,096) | (1,099)
Accumulated benefit obligation | (14,779) | (15,217)
Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (5,188) | (5,723)
Deferred tax | 21 | 19
Accumulated other comprehensive income | 5,264 | 5,731
Net amount recognized | 97 | 27
Accumulated benefit obligation | (13,459) | (13,962)
Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (1,320) | (1,255)
Deferred tax | 93 | 91
Accumulated other comprehensive income | 34 | 38
Net amount recognized | (1,193) | (1,126)
Accumulated benefit obligation | (1,320) | (1,255)
International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (4,603) | (5,046)
Deferred tax | (1) | 0
Accumulated other comprehensive income | 5,251 | 5,713
Net amount recognized | 647 | 667
Accumulated benefit obligation | (12,874) | (13,285)
International | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (4,603) | (5,046)
Deferred tax | (1) | 0
Accumulated other comprehensive income | 5,251 | 5,713
Net amount recognized | 647 | 667
Accumulated benefit obligation | (12,874) | (13,285)
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 | (1,905) | (1,932)
Deferred tax | 115 | 110
Accumulated other comprehensive income | 47 | 56
Net amount recognized | (1,743) | (1,766)
Accumulated benefit obligation | (1,905) | (1,932)
Domestic | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (585) | (677)
Deferred tax | 22 | 19
Accumulated other comprehensive income | 13 | 18
Net amount recognized | (550) | (640)
Accumulated benefit obligation | (585) | (677)
Domestic | Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (1,320) | (1,255)
Deferred tax | 93 | 91
Accumulated other comprehensive income | 34 | 38
Net amount recognized | (1,193) | (1,126)
Accumulated benefit obligation | $ (1,320) | $ (1,255)

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- Definition Projected Benefit Obligation of defined benefit plans, net of unrealized losses recorded in accumulated comprehensive income + References No definition available. + Details
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- Definition Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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