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Pension and Retirement Plans (Detail) - Components of net periodic benefit costs - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items] |  |
Decrease in minimum liability included in other comprehensive income (loss) | $ (475) | $ (1,252)
Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 0 | 0
Interest cost | 395 | 350
Expected return on plan assets | (312) | (268)
Amortization of net (gain)/loss | 169 | 209
Net periodic benefit cost | 252 | 291
Decrease in minimum liability included in other comprehensive income (loss) | (469) | (1,153)
Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 40 | 38
Interest cost | 47 | 44
Amortization of net (gain)/loss | (18) | 15
Net periodic benefit cost | 69 | 97
Decrease in minimum liability included in other comprehensive income (loss) | (6) | (99)
Foreign |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Decrease in minimum liability included in other comprehensive income (loss) | (462) | (1,139)
Foreign | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 0 | 0
Interest cost | 370 | 321
Expected return on plan assets | (312) | (268)
Amortization of net (gain)/loss | 170 | 205
Net periodic benefit cost | 228 | 258
Decrease in minimum liability included in other comprehensive income (loss) | (462) | (1,139)
Foreign | Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 0 | 0
Interest cost | 0 | 0
Amortization of net (gain)/loss | 0 | 0
Net periodic benefit cost | 0 | 0
Decrease in minimum liability included in other comprehensive income (loss) | 0 | 0
U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Decrease in minimum liability included in other comprehensive income (loss) | (13) | (113)
U.S. | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 0 | 0
Interest cost | 25 | 29
Expected return on plan assets | 0 | 0
Amortization of net (gain)/loss | (1) | 4
Net periodic benefit cost | 24 | 33
Decrease in minimum liability included in other comprehensive income (loss) | (7) | (14)
U.S. | Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 40 | 38
Interest cost | 47 | 44
Amortization of net (gain)/loss | (18) | 15
Net periodic benefit cost | 69 | 97
Decrease in minimum liability included in other comprehensive income (loss) | $ (6) | $ (99)

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + 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 (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + 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 (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + 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 (h)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + 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 (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan. + 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 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
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