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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, 2017 | Sep. 30, 2016
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Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets fair value | $ 8,239 | $ 7,629
Fair Value Measurements Using Inputs Considered as Level I |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets fair value | 8,239 | 7,629
Fair Value Measurements Using Inputs Considered as Level II |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets fair value | 0 | 0
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 | 62 | 86
Cash on deposit | Fair Value Measurements Using Inputs Considered as Level I |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets fair value | 62 | 86
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 | 8,177 | 7,543
Pooled funds | Fair Value Measurements Using Inputs Considered as Level I |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets fair value | 8,177 | 7,543
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 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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