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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
May 31, 2020 | May 31, 2019 | May 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accrued benefit liability | $ 37,000 | $ 29,700 |
Unrecognized net actuarial loss | $ 16,200 | $ 6,700 |
Expected return on plan assets | 4.80% | 4.90% |
Expected contributions next twelve months | $ 4,400 |  |
Expected contributions in year two | 3,900 |  |
Expected contributions in year three | 4,100 |  |
Expected contributions in year four | 4,200 |  |
Expected contributions in year five | 4,400 |  |
Expected contributions in year six | 4,500 |  |
Expected contributions thereafter | 24,300 |  |
Fair value of plan assets | 68,341 | $ 62,267 | $ 58,781
Projected benefit obligation | 105,357 | 91,935 | 86,341
Net periodic pension (benefit) cost | (80) | 242 |
Employer contributions | 2,098 | 4,034 |
Supplemental Executive Retirement Plan (SERP) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | $ 8,400 | 8,600 | 8,200
United States Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Required years of service for plan eligibility | 1 year |  |
Employer contributions | $ 74,300 | 67,600 | 56,700
Canada | DPSP and RRSP |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 2,600 | 2,500 | $ 2,800
Pension Plan of Immaterial Acquisitions |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 7,300 | 7,300 |
Projected benefit obligation | $ 9,400 | $ 7,900 |

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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, 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)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920 + Details
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