Debt and Receivables Securitization - Additional Information (Detail) € in Thousands					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, 2021 USD ($)	May 31, 2020 USD ($)	May 31, 2019 USD ($)	Aug. 23, 2019 USD ($) subsidiarie	Aug. 23, 2019 EUR (€) subsidiarie	Jul. 28, 2017 USD ($)
Debt And Receivables Securitization [Line Items]
Number of European subsidiaries | subsidiarie									2	2
Debt Issuance Costs, Net									$ 134,000
Unamortized portion of debt issuance costs						$ 116,000
Loss on extinguishment of debt	$ 4,034,000					0	$ 4,034,000	$ 0
Remaining borrowing capacity						500,000,000
Unsecured Revolving Credit Facility
Debt And Receivables Securitization [Line Items]
Maximum borrowing capacity						$ 500,000,000
Maturity date						2023-02
Borrowings outstanding						$ 0
Debt issuance costs						$ 805,000
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						$ 17,350,000
Drawn amount of letter of credit outstanding						0
Securities Sold under Agreements to Repurchase
Debt And Receivables Securitization [Line Items]
Facility fee						$ 5,500	$ 132,000	$ 202,000
4.30% Senior Notes due August 1, 2032
Debt And Receivables Securitization [Line Items]
Principal amount											$ 200,000,000
Debt, interest rate						4.30%	4.30%				4.30%
Debt, maturity date						Aug. 01, 2032	Aug. 01, 2032
Unamortized portion of debt issuance costs						$ 1,575,000	$ 1,717,000
Price of debt instrument sold to the public as a percentage of principal amount											99.901%
Yield to maturity											4.309%
Unamortized debt discount						$ 147,000	$ 161,000				$ 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]
Principal amount			$ 250,000,000
Debt, interest rate			4.55%			4.55%	4.55%
Debt, maturity date						Apr. 15, 2026	Apr. 15, 2026
Unamortized portion of debt issuance costs						$ 918,000	$ 1,108,000
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			$ 212,000	$ 256,000
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						$ 21,000	$ 28,000
Debt issuance cost				$ 80,000
Senior Notes Series A 1.56%
Debt And Receivables Securitization [Line Items]
Principal amount | €										€ 36,700
Debt, interest rate									1.56%	1.56%
Debt, maturity date		Aug. 23, 2031
Debt to be repaid | €		€ 30,000
Debt instrument payments date		Aug. 23, 2029
Remaining debt to repaid | €		€ 6,700
Senior Notes Series B
Debt And Receivables Securitization [Line Items]
Principal amount | €										€ 55,000
Debt, interest rate									1.90%	1.90%
Debt, maturity date		Aug. 23, 2034
Debt to be repaid | €		€ 23,300
Debt instrument payments date		Aug. 23, 2031
Remaining debt to repaid | €		€ 31,700
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