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Net Periodic Benefit Costs (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Aug. 31, 2021 | Aug. 31, 2020 | Aug. 31, 2019
Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 50.00% |  |
Other Postretirement Benefit Plan, Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Foreign Defined Benefit Plan, Net Periodic Benefit Cost | $ (200) | $ (300) | $ (100)
Foreign Plan Member |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Interest cost | 198 | 171 | 257
Expected return on assets | (347) | (357) | (345)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | 4 | (18) | (65)
Amortization of actuarial loss | 139 | 205 | 263
Defined Benefit Plan Cost of Special Events | 0 | (728) | (56)
Foreign Defined Benefit Plan, Net Periodic Benefit Cost | 110 | (443) | 504
Defined Benefit Plan, Service Cost | 116 | 284 | 450
Domestic Plan Member |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Interest cost | 1,156 | 1,331 | 1,694
Expected return on assets | (1,610) | (1,770) | (2,208)
Amortization of actuarial loss | 1,322 | 1,212 | 990
Foreign Defined Benefit Plan, Net Periodic Benefit Cost | $ 868 | $ 773 | $ 476

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