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Retirement Plans - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2020 | Aug. 31, 2019 | May 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |
401(k) plan description | In 2020, we announced the closing of our U.S.-based defined benefit pension plans to new non-union employees hired on or after January 1, 2020. We will introduce an all-401-(k) plan retirement benefit structure for eligible employees with a higher company match of up to 8% across all U.S.-based operating companies in 2022. During calendar 2021, current eligible employees under the Portable Pension Account (“PPA”) pension formula will be given a one-time option to continue to be eligible for pension compensation credits under the existing PPA formula and remain in the existing 401(k) plan with its match of up to 3.5%, or to cease receiving compensation credits under the pension plan and move to the new 401(k) plan with the higher match of up to 8%. Changes to the new 401(k) plan structure become effective beginning January 1, 2022. While this new program will provide employees greater flexibility and reduce our long-term pension costs, it will not have a material impact on current or near-term financial results. |  |
Future Plan Structure [Member] | Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company matching contributions to eligible employees | 8.00% |  |
Current Plan Structure [Member] | Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company matching contributions to eligible employees | 3.50% |  |
Voluntary Contribution [Member] | U.S. Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan contributions by employer |  | $ 1,000,000,000.0 |
Pension Plans [Member] | U.S. Pension Plans [Member] | Forecast [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan contributions by employer |  |  | $ 0

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