Debt and Receivables Securitization - Additional Information (Detail) € in Thousands							1 Months Ended	12 Months Ended
	Jan. 13, 2020 USD ($)	Aug. 30, 2019 USD ($)	Aug. 23, 2019 EUR (€)	Feb. 16, 2018 USD ($)	Apr. 15, 2014 USD ($)	Aug. 10, 2012 USD ($)	Jun. 30, 2017 USD ($)	May 31, 2020 USD ($)	May 31, 2019 USD ($)	May 31, 2018 USD ($)	Jan. 12, 2020 USD ($)	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								$ 126,000
Loss on extinguishment of debt		$ 4,034,000						4,034,000
Maximum undivided ownership interests WRC may sell without recourse on revolving basis								10,000,000
Remaining borrowing capacity								499,750,000
Unsecured Revolving Credit Facility
Debt And Receivables Securitization [Line Items]
Maximum borrowing capacity								500,000,000
Debt maturity period				3 years
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								$ 15,300,000
Drawn amount of letter of credit outstanding								0
Letter of Credit
Debt And Receivables Securitization [Line Items]
Letter of credit amount outstanding								$ 250,000
Securities Sold under Agreements to Repurchase
Debt And Receivables Securitization [Line Items]
Maximum borrowing capacity	$ 10,000,000										$ 50,000,000
Debt maturity period	1 year
Number of days past due trade accounts receivables are ineligible for securitization								90 days
Borrowings outstanding								$ 0
Facility fee								$ 132,000	$ 202,000	$ 383,000
Securities Sold under Agreements to Repurchase | AR Facility
Debt And Receivables Securitization [Line Items]
Maturity date	2021-01
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								$ 1,717,000	$ 1,857,000
Price of debt instrument sold to the public as a percentage of principal amount														99.901%
Yield to maturity														4.309%
Unamortized debt discount								$ 161,000	$ 174,000					$ 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								$ 1,108,000	$ 1,297,000
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			$ 256,000	$ 300,000
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								$ 28,000	$ 35,000
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