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Employee Pension Plans - Additional Information (Detail) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2022 USD ($) Beneficiary | May 31, 2023 USD ($) | May 31, 2022 USD ($) | May 31, 2021 USD ($) | Dec. 01, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Description of investment policy and strategy for the defined benefit plan |  | The investment policy and strategy for the defined benefit plans is: (i) long-term in nature with liquidity requirements that are anticipated to be minimal due to the projected normal retirement date of the average employee and the current average age of participants; (ii) to earn nominal returns, net of investment fees, equal to or in excess of the defined benefit plans’ respective liability growth rate; and (iii) to include a diversified asset allocation of domestic and international equities and fixed income investments. |  |  |
Expected employer contribution to defined benefit plan during fiscal 2024 |  | $ 1,669 |  |  |
Net periodic benefit cost |  | $ 23,866 | $ 18,087 | $ 17,554 |
Discount rate |  | 4.25% | 2.74% | 2.65% |
Gerstenslager Company |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, funded percentage | 31.00% |  |  |  |
Defined benefit plan, benefit obligation, non-cash settlement charge | $ 4,774 |  |  |  |
Number of beneficiaries owed | Beneficiary | 220 |  |  |  |
Tempel Steel Company |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Pension and other postretirement benefit obligations, net |  |  |  |  | $ 40,160
Net periodic benefit cost |  | $ 135 | $ 85 |  |
Australian Sustainable Energy Solutions |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accrued liability of unfunded plans included in other liabilities |  | $ 6,045 | $ 6,249 |  |
Assumed salary rate increase |  | 2.75% | 2.75% | 2.75% |
Discount rate |  | 4.00% | 1.90% | 1.10% |

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + 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 (k)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + 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 (k)(2) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Description of investment policy and strategy for defined benefit plan asset. Includes, but is not limited to, investment allocation decision and factor pertinent to understanding investment policy and strategy for plan asset. Factor includes, but is not limited to, investment goal, risk management practice, permitted and prohibited investment including use of derivative, diversification, and relationship between plan asset and obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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