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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, 2017 | Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 7,629 |
Fair value of plan assets | 8,239 | $ 7,629
Net amount recognized | 12,352 | 14,022
Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 41 | 35
Interest cost | 415 | 614
Net amount recognized | 11,097 | 12,765
Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 38 | 27
Interest cost | 44 | 42
Net amount recognized | 1,255 | 1,257
Change in projected benefit obligation (“PBO”) | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | 20,393 | 19,001
Service cost | 42 | 35
Interest cost | 415 | 614
Changes in actuarial assumptions | (1,591) | 3,968
Foreign exchange impact | 651 | (2,069)
Benefits paid | 574 | 1,156
Projected benefit obligation | 19,336 | 20,393
Change in projected benefit obligation (“PBO”) | Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | 1,257 | 985
Service cost | 38 | 27
Interest cost | 44 | 42
Changes in actuarial assumptions | (84) | 203
Projected benefit obligation | 1,255 | 1,257
Changes in fair value of plan assets: |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 7,629 | 9,301
Fair value of plan assets | 8,239 | 7,629
Changes in fair value of plan assets: | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual gain on plan assets | 368 | 111
Company contributions | 548 | 662
Foreign exchange impact | 268 | (1,289)
Benefits paid | 574 | 1,156
Funded status \ net amount recognized | (11,097) | (12,764)
Changes in fair value of plan assets: | Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Funded status \ net amount recognized | (1,255) | (1,257)
International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net amount recognized | 10,420 | 11,936
International | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 41 | 35
Interest cost | 386 | 571
Net amount recognized | 10,420 | 11,936
International | Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 0 | 0
Interest cost | 0 | 0
Net amount recognized | 0 | 0
International | Change in projected benefit obligation (“PBO”) | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | 19,564 | 17,979
Service cost | 42 | 35
Interest cost | 386 | 571
Changes in actuarial assumptions | (1,582) | 3,948
Foreign exchange impact | 651 | (2,069)
Benefits paid | 402 | 900
Projected benefit obligation | 18,659 | 19,564
International | Change in projected benefit obligation (“PBO”) | Post Retirement |  |
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
Projected benefit obligation | 0 | 0
International | Changes in fair value of plan assets: | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 7,629 | 9,301
Actual gain on plan assets | 368 | 111
Company contributions | 376 | 406
Foreign exchange impact | 268 | (1,289)
Benefits paid | 402 | 900
Fair value of plan assets | 8,239 | 7,629
Funded status \ net amount recognized | (10,420) | (11,935)
International | Changes in fair value of plan assets: | Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Funded status \ net amount recognized | 0 | 0
Domestic |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net amount recognized | 1,932 | 2,086
Domestic | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 0 | 0
Interest cost | 29 | 43
Net amount recognized | 677 | 829
Domestic | Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 38 | 27
Interest cost | 44 | 42
Net amount recognized | 1,255 | 1,257
Domestic | Change in projected benefit obligation (“PBO”) | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | 829 | 1,022
Service cost | 0 | 0
Interest cost | 29 | 43
Changes in actuarial assumptions | (9) | 20
Foreign exchange impact | 0 | 0
Benefits paid | 172 | 256
Projected benefit obligation | 677 | 829
Domestic | Change in projected benefit obligation (“PBO”) | Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | 1,257 | 985
Service cost | 38 | 27
Interest cost | 44 | 42
Changes in actuarial assumptions | (84) | 203
Projected benefit obligation | 1,255 | 1,257
Domestic | Changes in fair value of plan assets: | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Actual gain on plan assets | 0 | 0
Company contributions | 172 | 256
Foreign exchange impact | 0 | 0
Benefits paid | 172 | 256
Fair value of plan assets | 0 | 0
Funded status \ net amount recognized | (677) | (829)
Domestic | Changes in fair value of plan assets: | Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Funded status \ net amount recognized | $ (1,255) | $ (1,257)

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive 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 (a)(4) -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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- Definition Amount of 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 (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + 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 -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + 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 (d)(5)(ii) -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 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation 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 (a)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + 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=82843861&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=64852052&loc=d3e1703-114919 + 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 payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + 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 -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) 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 (b)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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