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Pension and Retirement Plans (Detail) - Components of net periodic benefit costs - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items] |  |
Increase (decrease) in minimum liability included in other comprehensive income (loss) | $ (1,944) | $ 3,413
Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 41 | 35
Interest cost | 415 | 614
Expected return on plan assets | (268) | (357)
Amortization of net (gain)/loss | 374 | 169
Net periodic benefit cost | 562 | 461
Increase (decrease) in minimum liability included in other comprehensive income (loss) | (1,845) | 3,130
Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 38 | 27
Interest cost | 44 | 42
Amortization of net (gain)/loss | 15 | (79)
Net periodic benefit cost | 97 | (10)
Increase (decrease) in minimum liability included in other comprehensive income (loss) | (99) | 283
Foreign |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Increase (decrease) in minimum liability included in other comprehensive income (loss) | (1,831) | 3,105
Foreign | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 41 | 35
Interest cost | 386 | 571
Expected return on plan assets | (268) | (357)
Amortization of net (gain)/loss | 370 | 174
Net periodic benefit cost | 529 | 423
Increase (decrease) in minimum liability included in other comprehensive income (loss) | (1,831) | 3,105
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
Increase (decrease) in minimum liability included in other comprehensive income (loss) | 0 | 0
U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Increase (decrease) in minimum liability included in other comprehensive income (loss) | (113) | 308
U.S. | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 0 | 0
Interest cost | 29 | 43
Expected return on plan assets | 0 | 0
Amortization of net (gain)/loss | 4 | (5)
Net periodic benefit cost | 33 | 38
Increase (decrease) in minimum liability included in other comprehensive income (loss) | (14) | 25
U.S. | Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 38 | 27
Interest cost | 44 | 42
Amortization of net (gain)/loss | 15 | (79)
Net periodic benefit cost | 97 | (10)
Increase (decrease) in minimum liability included in other comprehensive income (loss) | $ (99) | $ 283

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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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