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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, 2018	Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Plan assets fair value	$ 8,270	$ 8,239
Fair Value Measurements Using Inputs Considered as Level I
Defined Benefit Plan Disclosure [Line Items]
Plan assets fair value	8,270	8,239
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	36	62
Cash on deposit | Fair Value Measurements Using Inputs Considered as Level I
Defined Benefit Plan Disclosure [Line Items]
Plan assets fair value	36	62
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	8,234	8,177
Pooled funds | Fair Value Measurements Using Inputs Considered as Level I
Defined Benefit Plan Disclosure [Line Items]
Plan assets fair value	8,234	8,177
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

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+ References

No definition available.

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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

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