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Debt - Narrative (Details) - USD ($) | 9 Months Ended |  |
--- | --- | --- | ---
Feb. 28, 2017 | May 31, 2016 | Feb. 29, 2016
Debt (Details) [Line Items] |  |  |
Debt | $ 5,800,000 | $ 6,300,000 | $ 8,200,000
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 | $ 150.0 |  |
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 |  |
Expiration date | Dec. 05, 2017 |  |
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 |  |
Unsecured Debt | Foreign Line of Credit |  |  |
Debt (Details) [Line Items] |  |  |
Borrowing capacity | $ 23,200,000 |  |
Expiration period (in days) | 364 days |  |
Debt | $ 5,800,000 | $ 6,300,000 | $ 8,200,000
Available credit | 17,400,000 |  |
Revolving Credit Facility | 2007 Loan Agreement | Letter of Credit |  |  |
Debt (Details) [Line Items] |  |  |
Borrowing capacity | 0 |  |
Revolving Credit Facility | 2007 Loan Agreement | Swingline Facility |  |  |
Debt (Details) [Line Items] |  |  |
Borrowing capacity | $ 0 |  |

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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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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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