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Debt (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 05, 2017 | May 31, 2018 | May 31, 2017 | Jun. 01, 2007
Unsecured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowing capacity |  | $ 25,000,000 |  |
Amount outstanding |  |  | $ 0 |
Outstanding borrowings |  | 0 |  |
Remaining borrowing capacity |  | $ 20.1 |  |
Maximum [Member] | Unsecured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term of debt instrument |  | 365 days |  |
Eurodollar [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate description |  | Eurodollar Rate for a one month interest period plus 1% plus, in each case, an applicable spread ranging from 0.175% to 0.60% |  |
London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate description |  | London interbank offered rate (LIBOR) plus an applicable spread ranging from 1.175% to 1.60% |  |
Loan Agreement [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Spread on base rate advances |  | 0.175% |  |
Spread on Eurodollar rate advances |  | 1.175% |  |
Facility fee |  | 0.20% |  |
Amount outstanding |  | $ 0 |  |
Standby letters of credit |  | $ 400,000 |  |
Loan Agreement [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Facility fee |  | 0.20% |  |
Loan Agreement [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Facility fee |  | 0.40% |  |
Loan Agreement [Member] | Federal Funds Rate [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Variable rate | 0.50% |  |  |
Loan Agreement [Member] | Eurodollar [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Variable rate | 1.00% |  |  |
Loan Agreement [Member] | Base Rate [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Variable rate | 0.175% |  |  |
Loan Agreement [Member] | Base Rate [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Variable rate | 0.60% |  |  |
Loan Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Variable rate | 1.175% |  |  |
Loan Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Variable rate | 1.60% |  |  |
Standby Letter Of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Standby letters of credit |  | $ 5,300,000 |  |
Line of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Standby letters of credit |  | 4,900,000 |  |
Line of Credit [Member] | Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowing capacity |  | 24,100,000 |  |
Outstanding borrowings |  | 7,900,000 | $ 6,200,000 |
Remaining borrowing capacity |  | $ 16.2 |  |
Weighted average interest rate |  | 2.90% | 4.10% |
Line of Credit [Member] | Maximum [Member] | Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term of debt instrument |  | 364 days |  |
2007 Loan Agreement [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowing capacity |  |  |  | $ 425,000,000
Starter basket for permitted payments of dividends and other capital stock payments |  |  |  | $ 75,000,000
Loan Agreement [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowing capacity | $ 375,000,000 |  |  |
Starter basket for permitted payments of dividends and other capital stock payments | $ 275,000,000 |  |  |
Expiration date | Jan. 05, 2022 |  |  |
Available increase in borrowing capacity |  | $ 150,000,000 |  |
Revolving Credit Facility [Member] | 2007 Loan Agreement [Member] | Letter of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowing capacity |  | 50,000,000 |  |
Revolving Credit Facility [Member] | 2007 Loan Agreement [Member] | Swingline Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowing capacity |  | $ 15,000,000 |  |

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- Definition Debt Instrument, Covenant, Equity Transaction Restrictions, Debt Limit + References No definition available. + Details
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- Definition Line of credit facility Eurodollar rate advances. + References No definition available. + Details
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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 Standby Letters of Credit + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + 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://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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