Debt and Receivables Securitization - Additional Information (Detail)					1 Months Ended	12 Months Ended
	Aug. 30, 2019 USD ($)	Aug. 23, 2019 EUR (€)	Apr. 15, 2014 USD ($)	Aug. 10, 2012 USD ($)	Jun. 30, 2017 USD ($)	May 31, 2022 USD ($)	May 31, 2021 USD ($)	May 31, 2020 USD ($)	May 19, 2022 USD ($)	Aug. 23, 2019 USD ($) Subsidiaries	Aug. 23, 2019 EUR (€) Subsidiaries	Jul. 28, 2017 USD ($)
Debt And Receivables Securitization [Line Items]
Number of European subsidiaries | Subsidiaries										2	2
Debt Issuance Costs, Net										$ 134,000
Loss on extinguishment of debt	$ 4,034,000							$ 4,034,000
Borrowings outstanding						$ 0
AR Facility
Debt And Receivables Securitization [Line Items]
Maximum borrowing capacity									$ 175,000,000
Borrowings outstanding						43,500,000
Facility fees incurred						547,000
Remaining borrowing capacity						131,500,000
Unsecured Revolving Credit Facility
Debt And Receivables Securitization [Line Items]
Bank and legal fees						805,000
Remaining borrowing capacity						$ 500,000,000
Line of credit facility, description						We maintain the Credit Facility with a group of lenders. On August 20, 2021, we amended and restated the Credit Facility, extending the final maturity from February 16, 2023 to August 20, 2026. Bank and legal fees of $805,000 were incurred as a result of the renewal. These costs have been deferred and are being amortized over the life of the Credit Facility to interest expense. Borrowings under the Credit Facility have maturities of up to one year. We have the option to borrow at rates equal to an applicable margin over the Daily LIBOR Rate, the Prime Rate of PNC Bank, National Association or the Overnight Bank Funding Rate.
Unsecured Revolving Credit Facility | Maximum
Debt And Receivables Securitization [Line Items]
Debt maturity period						1 year
Stand-by Letters of Credit
Debt And Receivables Securitization [Line Items]
Letter of credit amount outstanding						$ 16,637,000
4.30% Senior Notes due August 1, 2032
Debt And Receivables Securitization [Line Items]
Debt, interest rate						4.30%	4.30%					4.30%
Debt, maturity date						Aug. 01, 2032	Aug. 01, 2032
Unamortized portion of debt issuance costs						$ 1,434,000	$ 1,575,000
Price of debt instrument sold to the public as a percentage of principal amount												99.901%
Yield to maturity												4.309%
Unamortized debt discount						$ 134,000	$ 147,000					$ 198,000
Debt issuance cost												$ 2,116,000
4.30% Senior Notes due August 1, 2032 | Interest Rate Swap
Debt And Receivables Securitization [Line Items]
Notional Amount					$ 150,000,000
Gain (Loss) Reclassified from Accumulated OCI (Effective Portion)					$ 3,098,000
4.55% Senior Notes due April 15, 2026
Debt And Receivables Securitization [Line Items]
Debt, interest rate			4.55%			4.55%	4.55%
Debt, maturity date						Apr. 15, 2026	Apr. 15, 2026
Unamortized portion of debt issuance costs						$ 728,000	$ 918,000
Price of debt instrument sold to the public as a percentage of principal amount			99.789%
Yield to maturity			4.573%
Unamortized debt discount			$ 528,000			$ 169,000	$ 212,000
Debt issuance cost			2,279,000
Settlement of hedge interest			$ (3,081,000)
4.60% Senior Notes due August 10, 2024
Debt And Receivables Securitization [Line Items]
Principal amount				$ 150,000,000
Debt, interest rate				4.60%		4.60%	4.60%
Debt, maturity date				Aug. 10, 2024		Aug. 10, 2024	Aug. 10, 2024
Unamortized portion of debt issuance costs						$ 15,000	$ 21,000
Debt issuance cost				$ 80,000
Series A and Series B Senior Unsecured Notes
Debt And Receivables Securitization [Line Items]
Unamortized portion of debt issuance costs						$ 106,000	$ 116,000
Senior Notes Series A 1.56%
Debt And Receivables Securitization [Line Items]
Principal amount | €											€ 36,700,000
Debt, interest rate										1.56%	1.56%
Debt, maturity date		Aug. 23, 2031
Debt to be repaid | €		€ 30,000,000
Debt instrument payments date		Aug. 23, 2029
Remaining debt to repaid | €		€ 6,700,000
Senior Notes Series B
Debt And Receivables Securitization [Line Items]
Principal amount | €											€ 55,000,000
Debt, interest rate										1.90%	1.90%
Debt, maturity date		Aug. 23, 2034
Debt to be repaid | €		€ 23,300,000
Debt instrument payments date		Aug. 23, 2031
Remaining debt to repaid | €		€ 31,700,000
6.50% Senior Notes due April 15, 2020
Debt And Receivables Securitization [Line Items]
Debt, interest rate	6.50%
Debt, maturity date	Apr. 15, 2020
Principal amount of debt redeemed	$ 150,000,000