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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, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012
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Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets fair value | $ 9,473 | $ 8,914
Fair Value Measurements Using Inputs Considered as Level I |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets fair value | 452 | 392
Fair Value Measurements Using Inputs Considered as Level II |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets fair value | 9,021 | 8,522
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 | 452 | 392
Cash on deposit | Fair Value Measurements Using Inputs Considered as Level I |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets fair value | 452 | 392
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 | 9,021 | 8,522
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 | 9,021 | 8,522
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 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 Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 4: 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=6867990&loc=d3e12355-114930 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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