Retirement Plans - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended
	Nov. 30, 2019	Nov. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
401(k) plan description	During the second quarter of 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. During 2020, 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, 2021. 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.
Maximum [Member] | Future Plan Structure [Member]
Defined Benefit Plan Disclosure [Line Items]
Company matching contributions to eligible employees	8.00%
Maximum [Member] | Current Plan Structure [Member]
Defined Benefit Plan Disclosure [Line Items]
Company matching contributions to eligible employees	3.50%
Voluntary Contribution [Member] | U.S. Pensions Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan contributions by employer	$ 1,000	$ 500