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Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Debt Issuance Cost (Details) - USD ($) $ in Millions | Feb. 28, 2021 | May 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Current portion | $ 1.3 | $ 0.4
Noncurrent portion | 5.0 | 0.6
Prepaid Expenses and Other Current Assets |  |
Debt Instrument [Line Items] |  |
Debt issuance costs | 0.6 | 0.3
Other Assets |  |
Debt Instrument [Line Items] |  |
Debt issuance costs | $ 2.3 | $ 0.5

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- Definition Amount, after accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section S45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68176171&loc=SL68176184-208336 + Details
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