Borrowings - Additional Information (Detail) - USD ($)								3 Months Ended	12 Months Ended
		Mar. 18, 2021	Apr. 30, 2020	Feb. 21, 2020	Dec. 20, 2017	May 09, 2014	Oct. 23, 2012	Nov. 30, 2018	May 31, 2021		May 31, 2020		May 31, 2015	Aug. 31, 2021	May 22, 2020	Feb. 27, 2019	Mar. 02, 2017	May 29, 2015
Debt Instrument [Line Items]
Maturities of long-term debt in 2022									$ 1,400,000
Maturities of long-term debt in 2023									701,500,000
Maturities of long-term debt in 2024									340,200,000
Maturities of long-term debt in 2025									500,000
Maturities of long-term debt in 2026									300,000
Maturities of long-term debt thereafter									1,350,900,000
Credit facility, available liquidity									1,200,000,000
Liquidity available									$ 1,457,100,000
Consolidated indebtedness									57.80%		66.80%
Credit facility borrowing potential maximum capacity									$ 1,500,000,000
Issuance of Debt
Debt Instrument [Line Items]
Covenant leverage ratio									425.00%
Issuance of Debt | Scenario Forecast
Debt Instrument [Line Items]
Covenant leverage ratio														425.00%
Accounts Receivable Securitization Program with Two Banks, through May 21, 2024
Debt Instrument [Line Items]
Credit facility borrowing maximum capacity		$ 250,000,000				$ 200,000,000.0			$ 250,000,000.0						$ 250,000,000.0
Credit facility expiration date		May 21, 2024				May 21, 2021
Percentage of indirect economic interest held in SPE						100.00%
Outstanding balance									0
Unsecured senior notes, maturity date	[1]										May 21, 2024
Unsecured 3.45% senior notes due November 15, 2022
Debt Instrument [Line Items]
Issuance of note							$ 300,000,000		$ 300,000,000.0		$ 300,000,000.0
Debt, interest rate							3.45%		3.45%	[2]	3.45%	[2]
Proceeds from issuance of note							$ 297,700,000
Unsecured senior notes, maturity date	[2]								Nov. 15, 2022		Nov. 15, 2022
Unsecured 5.25% notes due June 1, 2045
Debt Instrument [Line Items]
Issuance of note																	$ 50,000,000.0	$ 250,000,000
Debt, interest rate									5.25%	[3]	5.25%	[3]					5.25%	5.25%
Note Interest payment frequency, term									Interest on the 2045 Notes is payable semiannually in arrears on June 1st and December 1st of each year at a rate of 5.250% per year
Unsecured senior notes, maturity date	[3]								Jun. 01, 2045		Jun. 01, 2045
Unsecured 3.75% notes due March 15, 2027
Debt Instrument [Line Items]
Issuance of note									$ 400,000,000.0		$ 400,000,000.0						$ 400,000,000.0
Debt, interest rate									3.75%	[4]	3.75%	[4]					3.75%
Note Interest payment frequency, term									Interest on the 2027 Notes is payable semiannually in arrears on March 15th and September 15th of each year, at a rate of 3.750% per year
Unsecured senior notes, maturity date	[4]								Mar. 15, 2027		Mar. 15, 2027
Unsecured 4.55% senior notes due March 1, 2029
Debt Instrument [Line Items]
Issuance of note									$ 350,000,000.0		$ 350,000,000.0					$ 350,000,000.0
Debt, interest rate									4.55%	[5]	4.55%	[5]				4.55%
Note Interest payment frequency, term									Interest on the 2029 Notes accrues from February 27, 2019 and is payable semiannually in arrears on March 1st and September 1st of each year, beginning September 1, 2019, at a rate of 4.550% per year.
Unsecured senior notes, maturity date	[5]								Mar. 01, 2029		Mar. 01, 2029
Unsecured 4.25% notes due January 15, 2048
Debt Instrument [Line Items]
Issuance of note					$ 300,000,000.0				$ 300,000,000.0		$ 300,000,000.0
Debt, interest rate					4.25%				4.25%	[6]	4.25%	[6]
Note Interest payment frequency, term									Interest on the 2048 Notes accrues from December 20, 2017 and is payable semiannually in arrears on January 15th and July 15th of each year, beginning July 15, 2018, at a rate of 4.250% per year.
Unsecured senior notes, maturity date	[6]								Jan. 15, 2048		Jan. 15, 2048
Unsecured 6.50% senior notes due February 15, 2018
Debt Instrument [Line Items]
Debt, interest rate					6.50%
Unsecured senior notes, maturity date									Feb. 15, 2018
Repayments of unsecured senior notes					$ 250,000,000.0
Minimum | Issuance of Debt
Debt Instrument [Line Items]
Covenant leverage ratio									375.00%
Interest coverage ratio									350.00%
Minimum | Accounts Receivable Securitization Program with Two Banks, through May 21, 2024
Debt Instrument [Line Items]
Monthly unused commitment fee									0.30%
Maximum | Accounts Receivable Securitization Program with Two Banks, through May 21, 2024
Debt Instrument [Line Items]
Monthly unused commitment fee									0.50%
Margin
Debt Instrument [Line Items]
Basis spread on variable rate									0.85%
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility, available liquidity									$ 960,400,000
Credit facility borrowing maximum capacity								$ 1,300,000,000					$ 800,000,000.0
Credit facility expiration date								Oct. 31, 2023					Dec. 05, 2019
Payment of basis point fee			0.10%
Interest coverage ratio									1224.00%
Leverage ratio											217.00%
Unsecured senior notes, maturity date	[7]								Oct. 31, 2023		Oct. 31, 2023
Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Covenant leverage ratio			375.00%
Acquisition aggregate consideration			$ 100,000,000.0
Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Covenant leverage ratio			425.00%
Revolving Credit Facility | Euro-Rate | Investment Grade
Debt Instrument [Line Items]
Basis spread on variable rate			1.75%
Revolving Credit Facility | Euro-Rate | Non-Investment Grade
Debt Instrument [Line Items]
Basis spread on variable rate			2.00%
Revolving Credit Facility | Base Rate | Investment Grade
Debt Instrument [Line Items]
Basis spread on variable rate			0.75%
Revolving Credit Facility | Base Rate | Non-Investment Grade
Debt Instrument [Line Items]
Basis spread on variable rate			1.00%
New Credit Facility
Debt Instrument [Line Items]
Credit facility expiration date				Feb. 21, 2023
Debt, interest rate				0.612%
New Credit Facility | Foreign Borrower
Debt Instrument [Line Items]
Debt, interest rate				0.558%
New Credit Facility | Issuance of Debt
Debt Instrument [Line Items]
Covenant leverage ratio									375.00%
New Credit Facility | Term Loan
Debt Instrument [Line Items]
Credit facility borrowing maximum capacity				$ 300,000,000
New Credit Facility | Term Loan | Foreign Borrower
Debt Instrument [Line Items]
Credit facility borrowing maximum capacity				$ 100,000,000
New Credit Facility | Minimum | Issuance of Debt
Debt Instrument [Line Items]
Interest coverage ratio									350.00%
Aggregate consideration for acquisition									$ 50,000,000
New Credit Facility | Maximum | Issuance of Debt
Debt Instrument [Line Items]
Covenant leverage ratio			425.00%						425.00%

[1] At May 31, 2020, the accounts receivable securitization program is adjusted for debt issuance costs, net of amortization, of approximately $0.2 million, respectively.

[2] The $300.0 million face amount of the notes due 2022 is adjusted for the amortization of the original issue discount and mark-to-market derivative asset of approximated $0.1 million and ($0.8 million) at May 31, 2021 and approximated $0.1 million and ($1.3 million) at May 31, 2020, respectively.  The original issue discount effectively reduced the ultimate proceeds from the financing.  The effective interest rate on the notes, including the amortization of the discount, is 3.465%.  At May 31, 2021 and 2020, the notes are reduced by debt issuance costs, net of amortization, for approximately $0.4 million and $0.6 million, respectively.

[3] The $250.0 million face amount of the notes due 2045 is adjusted for the amortization of the original issue discount, which approximated $1.4 million at May 31, 2021 and 2020. The original issue discount effectively reduced the ultimate proceeds from the financing. The effective interest rate on the notes, including the amortization of the discount, is 5.29%. In March 2017, as a further issuance of the 5.25% notes due 2045, we closed an offering of $50.0 million aggregate principal, which is adjusted for the unamortized premium received at issuance, which approximated $2.9 million at May 31, 2021 and 2020.  The premium effectively increased the proceeds from the financing.  The effective interest rate on the $50.0 million notes issued March 2017 is 4.839%.  At May 31, 2021 and 2020, the notes are adjusted for debt issuance costs, net of amortization, for approximately $2.8 million and $2.9 million, respectively.

[4] The $400.0 million face amount of the notes due 2027 is adjusted for the amortization of the original issue discount, which approximated $0.2 million and $0.3 million at May 31, 2021 and 2020, respectively.  The original issue discount effectively reduced the ultimate proceeds from the financing.  The effective interest rate on the notes, including the amortization of the discount, is 3.767%.  At May 31, 2021 and 2020, the notes are adjusted for debt issuance costs, net of amortization, for approximately $2.3 million and $2.6 million, respectively.

[5] The $350.0 million aggregate principal amount of the notes due 2029 is adjusted for the amortization of the original issue discount, which approximated $0.4 million and $0.5 million at May 31, 2021 and 2020, respectively. The original issue discount effectively reduced the ultimate proceeds from the financing. The effective interest rate on the notes, including the amortization of the discount, was 4.568%.  At May 31, 2021 and 2020, the notes were adjusted for debt issuance costs, net of amortization, for approximately $2.7 million and $3.0 million, respectively.

[6] The $300.0 million face amount of the notes due 2048 is adjusted for the debt issuance cost, net of amortization, which approximated $3.3 million and $3.4 million at May 31, 2021 and 2020, respectively. The effective interest rate on the notes is 4.25%.

[7] Interest at May 31, 2021 was tied to LIBOR and averaged 1.4609% for USD denominated debt ($37.7 million), 1.3950% for AUD denominated debt ($44.0 million) and 1.3750% on EUR denominated debt ($257.9 million).  Interest at May 31, 2020 was tied to LIBOR and averaged 1.5505% for USD denominated debt ($218.3 million), 1.4650% for AUD denominated debt ($37.2 million) and 1.3750% on EUR denominated debt ($167.5 million).  At May 31, 2021 and 2020, the revolving credit facility is adjusted for debt issuance costs, net of amortization, for approximately $2.6 million and $3.7 million, respectively.