Debt Instrument, Available Increase in Borrowing Capacity

No definition available.

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Period Type:	instant

- Definition

Debt Instrument Covenant Equity Transaction Restrictions Debt Limit

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line of credit facility base rate advances.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- 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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Balance Type:	na
Period Type:	instant

- Definition

Standby Letters of Credit

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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.

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Period Type:	instant

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Debt (Details) - USD ($)				12 Months Ended
Debt (Details) - USD ($)	Jan. 24, 2020	Sep. 23, 2019	Jan. 05, 2017	May 31, 2020	May 31, 2019	Jun. 01, 2007
Unsecured Debt [Member]
Debt Instrument [Line Items]
Borrowing capacity				$ 25,000,000.0
Outstanding borrowings				0	$ 0
Remaining borrowing capacity				$ 21.1
Maximum [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Term of debt instrument				365 days
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%
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				$ 4,300,000
Line of Credit [Member]
Debt Instrument [Line Items]
Standby letters of credit				3,900,000
Line of Credit [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Borrowing capacity				25,400,000
Outstanding borrowings				7,900,000	$ 7,300,000
Remaining borrowing capacity				$ 17,500,000
Weighted average interest rate				4.60%	4.10%
Line of Credit [Member] \| Maximum [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Term of debt instrument				364 days
UK Long-term Debt [Member]
Debt Instrument [Line Items]
Face amount		$ 2.0
Long-term Debt, Gross				$ 2.5
UK Long-term Debt [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Variable rate		1.77%		0.10%
UK Long-term Debt [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 6.6
Remaining borrowing capacity				$ 8.1
UK Long-term Debt [Member] \| Line of Credit [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Variable rate	1.77%			0.10%
2007 Loan Agreement [Member]
Debt Instrument [Line Items]
Borrowing capacity						$ 425,000,000.0
Starter basket for permitted payments of dividends and other capital stock payments						$ 75,000,000.0
Loan Agreement [Member]
Debt Instrument [Line Items]
Borrowing capacity			$ 375,000,000.0
Starter basket for permitted payments of dividends and other capital stock payments			$ 275,000,000.0
Available increase in borrowing capacity				$ 150,000,000.0
Long-term Debt				200,000,000.0
Revolving Credit Facility [Member] \| 2007 Loan Agreement [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Borrowing capacity				50,000,000.0
Revolving Credit Facility [Member] \| 2007 Loan Agreement [Member] \| Swingline Facility [Member]
Debt Instrument [Line Items]
Borrowing capacity				$ 15,000,000.0