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Debt - Narrative (Details) - USD ($) | 9 Months Ended |  |
--- | --- | --- | ---
Feb. 28, 2018 | May 31, 2017 | Feb. 28, 2017
Debt (Details) [Line Items] |  |  |
Standby letters of credit | $ 5,300,000 |  |
Debt | 7,700,000 | $ 6,200,000 | $ 5,800,000
Loan Agreement |  |  |
Debt (Details) [Line Items] |  |  |
Borrowing capacity | 375,000,000 |  |
Debt limit before equity transaction restrictions apply | $ 275,000,000 |  |
Expiration date | Jan. 05, 2022 |  |
Facility fee (percentage) | 0.20% |  |
Increase in borrwoing capacity available under accordion feature | $ 150,000,000 |  |
Standby letters of credit | $ 400,000 |  |
Loan Agreement | Minimum |  |  |
Debt (Details) [Line Items] |  |  |
Facility fee (percentage) | 0.20% |  |
Loan Agreement | Maximum |  |  |
Debt (Details) [Line Items] |  |  |
Facility fee (percentage) | 0.40% |  |
Loan Agreement | Federal Funds Rate |  |  |
Debt (Details) [Line Items] |  |  |
Variable rate (percentage) | 0.50% |  |
Loan Agreement | Eurodollar |  |  |
Debt (Details) [Line Items] |  |  |
Variable rate (percentage) | 1.00% |  |
Loan Agreement | Base Rate |  |  |
Debt (Details) [Line Items] |  |  |
Variable rate (percentage) | 0.175% |  |
Loan Agreement | Base Rate | Minimum |  |  |
Debt (Details) [Line Items] |  |  |
Variable rate (percentage) | 0.175% |  |
Loan Agreement | Base Rate | Maximum |  |  |
Debt (Details) [Line Items] |  |  |
Variable rate (percentage) | 0.60% |  |
Loan Agreement | London Interbank Offered Rate (LIBOR) | Minimum |  |  |
Debt (Details) [Line Items] |  |  |
Variable rate (percentage) | 1.175% |  |
Loan Agreement | London Interbank Offered Rate (LIBOR) | Maximum |  |  |
Debt (Details) [Line Items] |  |  |
Variable rate (percentage) | 1.60% |  |
2007 Loan Agreement |  |  |
Debt (Details) [Line Items] |  |  |
Borrowing capacity | $ 425,000,000 |  |
Debt limit before equity transaction restrictions apply | 75,000,000 |  |
Unsecured Debt | Domestic Line of Credit |  |  |
Debt (Details) [Line Items] |  |  |
Borrowing capacity | 25,000,000 |  |
Standby letters of credit | 4,900,000 |  |
Short-term debt | 0 | 0 | 0
Remaining borrowing capacity | $ 20,100,000 |  |
Expiration period (in days) | 365 days |  |
Secured Debt | Line of Credit |  |  |
Debt (Details) [Line Items] |  |  |
Borrowing capacity | $ 24,400,000 |  |
Expiration period (in days) | 364 days |  |
Debt | $ 7,700,000 | $ 6,200,000 | $ 5,800,000
Weighted average interest rate | 3.70% | 4.10% | 3.90%
Available credit | $ 16,700,000 |  |
Revolving Credit Facility | 2007 Loan Agreement | Letter of Credit |  |  |
Debt (Details) [Line Items] |  |  |
Borrowing capacity | 50,000,000 |  |
Revolving Credit Facility | 2007 Loan Agreement | Swingline Facility |  |  |
Debt (Details) [Line Items] |  |  |
Borrowing capacity | $ 15,000,000 |  |

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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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