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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

X
- Definition The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost) -URI http://asc.fasb.org/extlink&oid=6504192 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6504226 + Details
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- Definition Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=49168827 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)(4) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total. + 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=21915240&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=58740216&loc=d3e1928-114920 + Details
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- Definition 1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. + 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 (a) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Projected Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6522206 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Postretirement Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503904 + Details
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- Definition The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Benefits -URI http://asc.fasb.org/extlink&oid=49170737 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Postretirement Benefits -URI http://asc.fasb.org/extlink&oid=6521376 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + 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 (b)(3) -URI http://asc.fasb.org/extlink&oid=58740216&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 Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) from foreign currency exchange rate changes for benefit obligation for plans of a foreign operation whose functional currency is not the reporting currency. + 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 (a)(5) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency. + 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 (b)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total. + 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 (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: 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=21915240&loc=d3e1703-114919 + Details
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + 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=58740216&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=58740216&loc=d3e1928-114920 + Details
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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 2: 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=58740216&loc=d3e1928-114920 Reference 3: 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=58740216&loc=d3e1928-114920 + Details
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