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Description of Long Term Debt (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 31, 2022 | May 31, 2021 | Feb. 27, 2019 | Dec. 20, 2017 | Mar. 31, 2017 | Mar. 02, 2017 | May 29, 2015 | Oct. 23, 2012
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt, interest rate | [1] |  |  | 2.95% |  |  |  |  |  |  |
Debt, due date | [1] |  |  | Jan. 15, 2032 |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt, due date | [2] | Oct. 31, 2023 |  | Oct. 31, 2023 |  |  |  |  |  |  |
Debt issuance costs, net of amortization |  | $ 1.5 |  | $ 2.6 |  |  |  |  |  |  |
Unsecured $100M Term Loan due February 21, 2023 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt |  | $ 100.0 |  | $ 100.0 |  |  |  |  |  |  |
Debt, due date | [3] | Feb. 21, 2023 |  | Feb. 21, 2023 |  |  |  |  |  |  |
Unsecured $300M Term Loan due February 21, 2023 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt | [3] | $ 300.0 |  | $ 300.0 |  |  |  |  |  |  |
Debt, due date | [3] | Feb. 21, 2023 |  | Feb. 21, 2023 |  |  |  |  |  |  |
Unsecured 3.45% senior notes due November 15, 2022 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt |  | $ 300.0 |  | $ 300.0 |  |  |  |  |  |  | $ 300.0
Debt, interest rate |  | 3.45% | [4] | 3.45% | [4] |  |  |  |  |  | 3.45%
Debt, due date | [4] | Nov. 15, 2022 |  | Nov. 15, 2022 |  |  |  |  |  |  |
Debt issuance costs, net of amortization |  | $ 0.1 |  | $ 0.4 |  |  |  |  |  |  |
Debt instrument, effective interest rate |  | 3.465% |  | 3.465% |  |  |  |  |  |  |
Mark-to-market derivative asset |  | $ 0.3 |  | $ 0.8 |  |  |  |  |  |  |
Unsecured 3.75% notes due March 15, 2027 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt |  | $ 400.0 |  | $ 400.0 |  |  |  |  | $ 400.0 |  |
Debt, interest rate |  | 3.75% | [5] | 3.75% | [5] |  |  |  | 3.75% |  |
Debt, due date | [5] | Mar. 15, 2027 |  | Mar. 15, 2027 |  |  |  |  |  |  |
Debt issuance costs, net of amortization |  | $ 1.9 |  | $ 2.3 |  |  |  |  |  |  |
Amortization of debt discount premium |  | $ 0.3 |  | $ 0.2 |  |  |  |  |  |  |
Debt instrument, effective interest rate |  | 3.767% |  | 3.767% |  |  |  |  |  |  |
Unsecured 4.55% senior notes due March 1, 2029 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt |  | $ 350.0 |  | $ 350.0 |  | $ 350.0 |  |  |  |  |
Debt, interest rate |  | 4.55% | [6] | 4.55% |  | 4.55% |  |  |  |  |
Debt, due date |  | Mar. 01, 2029 | [6] | Mar. 01, 2029 |  |  |  |  |  |  |
Debt issuance costs, net of amortization |  | $ 2.3 |  | $ 2.7 |  |  |  |  |  |  |
Amortization of debt discount premium |  | $ 0.4 |  | $ 0.4 |  |  |  |  |  |  |
Debt instrument, effective interest rate |  | 4.568% |  | 4.568% |  |  |  |  |  |  |
Unsecured 2.95% notes due January 15, 2032 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt |  | $ 300.0 |  |  |  |  |  |  |  |  |
Debt, interest rate | [1] | 2.95% |  |  |  |  |  |  |  |  |
Debt, due date | [1] | Jan. 15, 2032 |  |  |  |  |  |  |  |  |
Debt issuance costs, net of amortization |  | $ 2.9 |  |  |  |  |  |  |  |  |
Amortization of debt discount premium |  | $ 0.6 |  |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  | 2.976% |  |  |  |  |  |  |  |  |
Unsecured 5.25% notes due June 1, 2045 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  | $ 50.0 | $ 250.0 |
Debt, interest rate |  | 5.25% | [7] | 5.25% | [7] |  |  |  | 5.25% | 5.25% |
Debt, due date | [7] | Jun. 01, 2045 |  | Jun. 01, 2045 |  |  |  |  |  |  |
Debt issuance costs, net of amortization |  | $ 2.6 |  | $ 2.8 |  |  |  |  |  |  |
Amortization of debt discount premium |  | $ 1.3 |  | $ 1.4 |  |  |  |  |  |  |
Debt instrument, effective interest rate |  | 5.29% |  | 5.29% |  |  |  |  |  |  |
Accounts Receivable Securitization Program with Two Banks, through May 21, 2024 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt, due date |  | May 21, 2024 |  |  |  |  |  |  |  |  |
Other Borrowings |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt, maturity year |  | 2027 |  | 2027 |  |  |  |  |  |  |
Unsecured 4.25% notes due January 15, 2048 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt |  | $ 300.0 |  | $ 300.0 |  |  | $ 300.0 |  |  |  |
Debt, interest rate |  | 4.25% | [8] | 4.25% | [8] |  | 4.25% |  |  |  |
Debt, due date | [8] | Jan. 15, 2048 |  | Jan. 15, 2048 |  |  |  |  |  |  |
Debt issuance costs, net of amortization |  | $ 3.2 |  | $ 3.3 |  |  |  |  |  |  |
Debt instrument, effective interest rate |  | 4.25% |  | 4.25% |  |  |  |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs, net of amortization |  | $ 0.2 |  | $ 0.5 |  |  |  |  |  |  |
United States Dollar Denominated Debt | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding debt |  |  |  | $ 37.7 |  |  |  |  |  |  |
United States Dollar Denominated Debt | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Average interest rate |  |  |  | 1.4609% |  |  |  |  |  |  |
United States Dollar Denominated Swingline Account | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding debt |  | $ 37.7 |  |  |  |  |  |  |  |  |
United States Dollar Denominated Swingline Account | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Average interest rate |  | 2.3699% |  |  |  |  |  |  |  |  |
United States Dollar Denominated Revolver | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding debt |  | $ 60.0 |  |  |  |  |  |  |  |  |
United States Dollar Denominated Revolver | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Average interest rate |  | 2.3096% |  |  |  |  |  |  |  |  |
Australian Dollar Denominated Debt | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding debt |  |  |  | $ 44.0 |  |  |  |  |  |  |
Australian Dollar Denominated Debt | Revolving Credit Facility | Australian Bank Bill Swap Bid Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Average interest rate |  |  |  | 1.395% |  |  |  |  |  |  |
Euro Denominated Debt | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding debt |  | $ 346.1 |  | $ 257.9 |  |  |  |  |  |  |
Euro Denominated Debt | Revolving Credit Facility | EUR LIBOR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Average interest rate |  | 1.25% |  | 1.375% |  |  |  |  |  |  |
Initial Aggregate Principal | Unsecured 5.25% notes due June 1, 2045 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt |  | $ 250.0 |  | $ 250.0 |  |  |  |  |  |  |
Additional Aggregate Principal | Unsecured 5.25% notes due June 1, 2045 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt |  | $ 50.0 |  |  |  |  |  | $ 50.0 |  |  |
Debt instrument, effective interest rate |  | 4.839% |  |  |  |  |  | 4.839% |  |  |
Unamortization of debt premium |  | $ 2.8 |  | $ 2.9 |  |  |  |  |  |  |
[1] | The $300.0 million face amount of the notes due 2032 is adjusted for the amortization of the original issue discount, which approximated $0.6 million at May 31, 2022. 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 2.976%. At May 31, 2022, the notes are adjusted for debt issuance costs, net of amortization, for approximately $2.9 million.
[2] | Interest at May 31, 2022 was tied to LIBOR and averaged 2.3699% for the USD denominated swingline account ($37.7 million), 2.3096% for the USD denominated revolver ($60.0 million), and 1.25% on EUR denominated debt ($346.1 million). 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). At May 31, 2022 and 2021, the revolving credit facility is adjusted for debt issuance costs, net of amortization, for approximately $1.5 million and $2.6 million, respectively.
[3] | At May 31, 2022 and 2021, the Term Loan is adjusted for deferred financing fees, net of amortization, of approximately $0.2 million and $0.5 million, respectively.
[4] | The $300.0 million face amount of the notes due 2022 is adjusted for the mark-to-market derivative asset of approximated ($0.3 million) and ($0.8 million) at May 31, 2022 and 2021, 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, 2022 and 2021, the notes are reduced by debt issuance costs, net of amortization, for approximately $0.1 million and $0.4 million, respectively.
[5] | 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 $0.2 million at May 31, 2022 and 2021, 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, 2022 and 2021, the notes are adjusted for debt issuance costs, net of amortization, for approximately $1.9 million and $2.3 million, respectively.
[6] | 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 at both May 31, 2022 and 2021. 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, 2022 and 2021, the notes were adjusted for debt issuance costs, net of amortization, for approximately $2.3 million and $2.7 million, respectively.
[7] | The $250.0 million face amount of the notes due 2045 is adjusted for the amortization of the original issue discount, which approximated $1.3 million and $1.4 million at May 31, 2022 and 2021, 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 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 $2.8 million and $2.9 million at May 31, 2022 and 2021, 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, 2022 and 2021, the notes are adjusted for debt issuance costs, net of amortization, for approximately $2.6 million and $2.8 million, respectively.
[8] | The $300.0 million face amount of the notes due 2048 is adjusted for the debt issuance cost, net of amortization, which approximated $3.2 million and $3.3 million at May 31, 2022 and 2021, respectively. The effective interest rate on the notes is 4.25%.

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