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Debt (Details) - USD ($)		12 Months Ended
	Dec. 16, 2020	May 31, 2021	May 31, 2020	Jan. 24, 2020	Sep. 23, 2019	Jan. 05, 2017
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount		$ 190,200,000	$ 218,500,000
Unsecured Debt
Debt Instrument [Line Items]
Borrowing capacity		10,000,000.0
Outstanding borrowings		0	0
Remaining borrowing capacity		$ 6.1
Maximum | Unsecured Debt
Debt Instrument [Line Items]
Term of debt instrument		365 days
Loan Agreement
Debt Instrument [Line Items]
Facility fee	0.40%
Standby letters of credit		$ 400,000
Loan Agreement | Federal Funds Rate
Debt Instrument [Line Items]
Variable rate	0.50%
Loan Agreement | Eurodollar
Debt Instrument [Line Items]
Variable rate	1.00%
Loan Agreement | Eurodollar | Maximum
Debt Instrument [Line Items]
Variable rate	1.60%
Loan Agreement | London Interbank Offered Rate (LIBOR) | Minimum
Debt Instrument [Line Items]
Variable rate	2.25%
Standby Letter Of Credit
Debt Instrument [Line Items]
Standby letters of credit		4,300,000
Line of Credit
Debt Instrument [Line Items]
Standby letters of credit		3,900,000
Debt, Long-term and Short-term, Combined Amount		7,900,000	7,900,000
Line of Credit | Secured Debt
Debt Instrument [Line Items]
Borrowing capacity		28,600,000
Outstanding borrowings		7,900,000	$ 7,900,000
Remaining borrowing capacity		$ 20,700,000
Weighted average interest rate		4.70%	4.60%
Line of Credit | Maximum | Secured Debt
Debt Instrument [Line Items]
Term of debt instrument		364 days
UK Long-term Debt
Debt Instrument [Line Items]
Face amount					$ 2.0
Outstanding on loan		$ 7,300,000
Debt, Long-term and Short-term, Combined Amount		$ 2.8	$ 10,600,000
UK Long-term Debt | Base Rate
Debt Instrument [Line Items]
Variable rate		1.77%
Debt Instrument, Interest Rate, Stated Percentage		0.10%
UK Long-term Debt | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 6.6
Remaining borrowing capacity		$ 4.8
Debt, Long-term and Short-term, Combined Amount		$ 4.5
UK Long-term Debt | Line of Credit | Base Rate
Debt Instrument [Line Items]
Variable rate		1.77%
Debt Instrument, Interest Rate, Stated Percentage		0.10%
Loan Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 250,000,000.0
Borrowing capacity	225,000,000.0					$ 375,000,000.0
Minimum amount of consolidated liquidity	$ 200,000,000.0
Percentage of consolidated total assets	10.00%
Aggregate limitation on acquisitions	$ 25,000,000.0
Limitation on cash dividends	5,200,000
Minimum liquidity covenant	300,000,000.0
Restricted payment basket, cap	$ 30,000,000.0
Debt, Long-term and Short-term, Combined Amount		$ 175,000,000.0	$ 200,000,000.0
Loan Agreement | Base Rate
Debt Instrument [Line Items]
Basis spread until receipt of financial statements	1.25%
Basis spread, drawn on delivery	0.60%
Loan Agreement | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Variable rate	0.25%
All-in interest rate		2.50%
Revolving Credit Facility | 2007 Loan Agreement | Letter of Credit
Debt Instrument [Line Items]
Borrowing capacity	$ 50,000,000.0
Revolving Credit Facility | 2007 Loan Agreement | Swingline Facility
Debt Instrument [Line Items]
Borrowing capacity	$ 15,000,000.0

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Debt Instrument, All In Rate

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Debt Instrument, Covenant, Basis Spread on Variable Rate, Drawn After Delivery

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Debt Instrument, Covenant, Basis Spread on Variable Rate, Receipt Of Financial Statements

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Debt Instrument Covenant Equity Transaction Restrictions Debt Maximum

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Line Of Credit Facility, Covenant, Liquidity Amount

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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.

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Standby Letters of Credit

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

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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.

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

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Contractual interest rate for funds borrowed, under the debt agreement.

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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.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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Weighted average interest rate of debt outstanding.

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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.

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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.

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

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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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