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U.S. Pension Plan Investment Allocations by Asset Category (Detail) - USD ($) $ in Thousands | Aug. 31, 2016 | Aug. 31, 2015
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Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 39,489 | $ 39,181
Percentage of fair value of pension plan assets | 100.00% | 100.00%
Cash and cash equivalents | Fair Value, Inputs, Level 1 |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 347 | $ 314
Percentage of fair value of pension plan assets | 0.90% | 0.80%
Fixed Income Securities | Fair Value, Inputs, Level 2 |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 11,723 | $ 12,581
Percentage of fair value of pension plan assets | 29.70% | 32.10%
Fixed Income Securities | Corporate Bond Securities | Fair Value, Inputs, Level 2 |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 8,372 | $ 9,481
Percentage of fair value of pension plan assets | 21.20% | 24.20%
Fixed Income Securities | Mutual Funds | Fair Value, Inputs, Level 2 |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 3,351 | $ 3,100
Percentage of fair value of pension plan assets | 8.50% | 7.90%
Equity Securities | Mutual Funds | Fair Value, Inputs, Level 1 |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 27,419 | $ 26,286
Percentage of fair value of pension plan assets | 69.40% | 67.10%

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- Definition Schedule of Pension Plan Assets by Fair Value [Line Items] + 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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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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