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Derivative Instrument and Hedging Activity - Narrative (Details) - Designated as Hedging Instrument - Interest Rate Swap - USD ($) | May 31, 2021 | May 31, 2020 | May 31, 2019 | May 31, 2018 | May 31, 2017
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Derivative rate |  |  |  |  | 1.81%
Derivative, notional amount |  |  | $ 65,000,000.0 | $ 65,000,000.0 | $ 65,000,000.0
Scenario, Forecast |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Derivative, notional amount | $ 25,000,000.0 | $ 25,000,000.0 |  |  |

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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