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U.S. Pension Plan Investment Allocations by Asset Category (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Aug. 31, 2021 | Aug. 31, 2020 | Aug. 31, 2019
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 39,696 | $ 39,935 |
Percentage of fair value of pension plan assets | 100.00% | 100.00% |
Foreign Plan Member |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 9,396 | $ 8,980 | $ 8,118
Defined Benefit Plan, Plan Assets, Benefits Paid | 293 | 300 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | $ 0 | $ (1,687) |
Fixed Income Securities |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |
Percentage of fair value of pension plan assets | 71.50% | 70.90% |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount | $ 28,389 | $ 28,297 |
Fixed Income Securities | Corporate Bond Securities | Fair Value, Inputs, Level 2 |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 0 | $ 0 |
Percentage of fair value of pension plan assets | 0.00% | 0.00% |
Fixed Income Securities | Mutual Funds | Fair Value, Inputs, Level 1 |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 23,564 | $ 23,091 |
Percentage of fair value of pension plan assets | 59.30% | 57.90% |
Fixed Income Securities | US Treasury Securities | Fair Value, Inputs, Level 2 |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 4,825 | $ 5,206 |
Percentage of fair value of pension plan assets | 12.20% | 13.00% |
Cash and cash equivalents | Fair Value, Inputs, Level 1 |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 0 | $ 0 |
Percentage of fair value of pension plan assets | 0.00% | 0.00% |
Equity Securities | Mutual Funds | Fair Value, Inputs, Level 1 |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 11,258 | $ 11,583 |
Percentage of fair value of pension plan assets | 28.40% | 29.00% |
Income Receivable |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | $ 55 |
Percentage of fair value of pension plan assets | 0.10% | 0.10% |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount | $ 49 |  |

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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