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Borrowings - Additional Information (Detail) - USD ($) |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2020 | Feb. 21, 2020 | Dec. 20, 2017 | May 09, 2014 | Dec. 09, 2013 | Oct. 23, 2012 | Nov. 30, 2018 | May 31, 2020 | May 31, 2019 | May 31, 2015 | May 22, 2020 | Feb. 27, 2019 | Mar. 02, 2017 | May 29, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long-term debt in 2021 |  |  |  |  |  |  |  |  | $ 80,900,000 |  |  |  |  |  |  |  |
Maturities of long-term debt in 2022 |  |  |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |
Maturities of long-term debt in 2023 |  |  |  |  |  |  |  |  | 700,600,000 |  |  |  |  |  |  |  |
Maturities of long-term debt in 2024 |  |  |  |  |  |  |  |  | 419,300,000 |  |  |  |  |  |  |  |
Maturities of long-term debt in 2025 |  |  |  |  |  |  |  |  | 0.0 |  |  |  |  |  |  |  |
Maturities of long-term debt thereafter |  |  |  |  |  |  |  |  | 1,338,100,000 |  |  |  |  |  |  |  |
Credit facility, available liquidity |  |  |  |  |  |  |  |  | 1,046,900,000 |  |  |  |  |  |  |  |
Liquidity available |  |  |  |  |  |  |  |  | $ 1,280,400,000 |  |  |  |  |  |  |  |
Consolidated indebtedness |  |  |  |  |  |  |  |  | 66.80% |  | 64.20% |  |  |  |  |  |
Credit facility borrowing potential maximum capacity |  |  |  |  |  |  |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, interest rate |  |  |  |  |  | 2.25% |  |  |  |  |  |  |  |  |  |  |
Note Interest payment frequency, term |  |  |  |  |  |  |  |  | Interest on the Convertible Notes semi-annually on June 15th and December 15th of each year |  |  |  |  |  |  |  |
Notes maturity date |  |  |  |  |  | 2020 |  |  |  |  |  |  |  |  |  |  |
Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant leverage ratio |  |  |  |  |  |  |  |  | 425.00% |  |  |  |  |  |  |  |
Accounts Receivable Securitization Program with Two Banks, through May 21, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing maximum capacity |  |  |  |  | $ 200,000,000.0 |  |  |  | $ 250,000,000.0 |  |  |  |  | $ 250,000,000.0 |  |  |
Credit facility expiration date |  |  |  |  | May 21, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of indirect economic interest held in SPE |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |  |  |  | $ 80,000,000.0 |  |  |  |  |  |  |  |
Unsecured senior notes, maturity date |  |  |  |  |  |  |  |  | May 21, 2021 |  | May 21, 2021 |  |  |  |  |  |
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% |  | 3.45% |  |  |  |  |  |
Proceeds from issuance of note |  |  |  |  |  |  | $ 297,700,000 |  |  |  |  |  |  |  |  |  |
Unsecured senior notes, maturity date |  |  |  |  |  |  |  |  | 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% | [1] | 5.25% | [1] |  |  |  | 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 | [1] |  |  |  |  |  |  |  | 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% | [2] | 3.75% | [2] |  |  |  | 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 | [2] |  |  |  |  |  |  |  | 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% | [3] | 4.55% | [3] |  |  | 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 | [3] |  |  |  |  |  |  |  | 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% | [4] | 4.25% | [4] |  |  |  |  |
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 | [4] |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured 2.25% Convertible Senior Notes due December 15, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of note |  |  |  |  |  |  |  |  | $ 205,000,000.0 |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Debt instrument, conversion rate |  |  |  |  |  |  |  |  | 19,221.062000 |  |  |  |  |  |  |  |
Debt instrument, conversion of common stock, debt amount |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |
Debt instrument, conversion price |  |  |  |  |  |  |  |  | $ 52.12 |  |  |  |  |  |  |  |
Debt conversion, description |  |  |  |  |  |  |  |  | The Convertible Notes became convertible at any time prior to the close of business on November 26, 2018 |  |  |  |  |  |  |  |
Settlement of convertible notes in cash |  |  |  |  |  |  |  |  | $ 204,600,000 |  |  |  |  |  |  |  |
Number of shares issued to settle convertible notes |  |  |  |  |  |  |  |  | 598,601 |  |  |  |  |  |  |  |
Unsecured 2.25% Convertible Senior Notes due December 15, 2020 | Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of note |  |  |  |  |  | $ 205,000,000 |  |  |  |  |  |  |  |  |  |  |
Minimum | Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant leverage ratio |  |  |  |  |  |  |  |  | 375.00% |  |  |  |  |  |  |  |
Aggregate consideration for acquisition |  |  |  |  |  |  |  |  | $ 100,000,000.0 |  |  |  |  |  |  |  |
Interest coverage ratio |  |  |  |  |  |  |  |  | 350.00% |  |  |  |  |  |  |  |
Minimum | Accounts Receivable Securitization Program with Two Banks, through May 21, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly unused commitment fee |  |  |  |  |  |  |  |  | 0.30% |  |  |  |  |  |  |  |
Maximum | Accounts Receivable Securitization Program with Two Banks, through May 21, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly unused commitment fee |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |
Margin |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  | 0.95% |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, available liquidity |  |  |  |  |  |  |  |  | $ 877,000,000.0 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | 831.00% |  |  |  |  |  |  |  |
Leverage ratio |  |  |  |  |  |  |  |  | 289.00% |  |  |  |  |  |  |  |
Unsecured senior notes, maturity date | [5] |  |  |  |  |  |  |  | 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate consideration for acquisition |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |
Interest coverage ratio |  |  |  |  |  |  |  |  | 350.00% |  |  |  |  |  |  |  |
New Credit Facility | Maximum | Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant leverage ratio |  | 425.00% |  |  |  |  |  |  | 425.00% |  |  |  |  |  |  |  |
[1] | 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, 2020 and 2019. 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 and $3.0 million at May 31, 2020 and 2019, respectively. 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, 2020 and 2019, the notes are adjusted for debt issuance costs, net of amortization, for approximately $2.9 million and $3.0 million, respectively.
[2] | The $400.0 million face amount of the notes due 2027 is adjusted for the amortization of the original issue discount, which approximated $0.3 million and $0.4 million at May 31, 2020 and 2019, 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, 2020 and 2019, the notes are adjusted for debt issuance costs, net of amortization, for approximately $2.6 million and $3.0 million, respectively.
[3] | The $350.0 million aggregate principal amount of the notes due 2029 is adjusted for the amortization of the original issue discount, which approximated $0.5 million at May 31, 2020 and 2019. 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, 2020 and 2019, the notes were adjusted for debt issuance costs, net of amortization, for approximately $3.0 million and $3.5 million, respectively.
[4] | The $300.0 million face amount of the notes due 2048 is adjusted for the debt issuance cost, net of amortization, which approximated $3.4 million and $3.5 million at May 31, 2020 and 2019, respectively. The effective interest rate on the notes is 4.25%.
[5] | Interest at May 31, 2020 was tied to LIBOR and averaged 1.5505% for USD denominated debt ($218,281), 1.4650% for AUD denominated debt ($37,199) and 1.3750% on EUR denominated debt ($167,537). Interest at May 31, 2019 was tied to LIBOR and averaged 3.6805% for USD denominated debt ($14,268), 2.69% for AUD denominated debt ($34,558), 3.23% on CAD denominated debt ($131,738) and 1.25% on EUR denominated debt ($159,745). At May 31, 2020 and 2019, the revolving credit facility is adjusted for debt issuance costs, net of amortization, for approximately $3.7 million and $3.9 million, respectively.

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- Definition Credit agreement leverage ratio. + References No definition available. + Details
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- Definition Debt covenant leverage ratio. + References No definition available. + Details
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- Definition Debt instrument conversion rate. + References No definition available. + Details
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- Definition Debt instrument orginal principal amount converted to commonStock. + References No definition available. + Details
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- Definition Debt instrument unused borrowing capacity fee percentage. + References No definition available. + Details
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- Definition Interest coverage ratio. + References No definition available. + Details
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- Definition Interest payment frequency. + References No definition available. + Details
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- Definition Line of Credit Facility, Potential Maximum Borrowing Capacity + References No definition available. + Details
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Balance Type: | credit
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