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Pension and Retirement Plans (Detail) - Fair value of the assets held by the UK pension plan by asset category - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets fair value | $ 7,629 | $ 9,301
Fair Value Measurements Using Inputs Considered as Level I |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets fair value | 86 | 324
Fair Value Measurements Using Inputs Considered as Level II |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets fair value | 7,543 | 8,977
Fair Value Measurements Using Inputs Considered as Level III |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets fair value | 0 | 0
Cash on deposit |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets fair value | 86 | 324
Cash on deposit | Fair Value Measurements Using Inputs Considered as Level I |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets fair value | 86 | 324
Cash on deposit | Fair Value Measurements Using Inputs Considered as Level II |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets fair value | 0 | 0
Cash on deposit | Fair Value Measurements Using Inputs Considered as Level III |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets fair value | 0 | 0
Pooled funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets fair value | 7,543 | 8,977
Pooled funds | Fair Value Measurements Using Inputs Considered as Level I |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets fair value | 0 | 0
Pooled funds | Fair Value Measurements Using Inputs Considered as Level II |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets fair value | 7,543 | 8,977
Pooled funds | Fair Value Measurements Using Inputs Considered as Level III |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets fair value | $ 0 | $ 0

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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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