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Description of Long Term Debt (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2019 | May 31, 2020 | May 31, 2019 | Feb. 27, 2019 | Dec. 20, 2017 | Mar. 31, 2017 | Mar. 02, 2017 | May 29, 2015 | Oct. 23, 2012 | May 27, 2011
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, due date | [1] |  | Oct. 31, 2023 |  | Oct. 31, 2023 |  |  |  |  |  |  |  |
Debt issuance costs, net of amortization |  |  | $ 3,700 |  | $ 3,900 |  |  |  |  |  |  |  |
Unsecured $100M Term Loan due February 21, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |
Debt, due date |  |  | Feb. 21, 2023 |  |  |  |  |  |  |  |  |  |
Unsecured $300M Term Loan due February 21, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |
Debt, due date |  |  | Feb. 21, 2023 |  |  |  |  |  |  |  |  |  |
Unsecured 6.125% senior notes due October 15, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, interest rate | [2] |  | 6.125% |  | 6.125% |  |  |  |  |  |  |  |
Debt, due date | [2] |  | Oct. 15, 2019 |  | Oct. 15, 2019 |  |  |  |  |  |  |  |
Debt issuance costs, net of amortization |  |  |  |  | $ 200 |  |  |  |  |  |  |  |
Repayments of debt |  | $ 450,000 |  |  |  |  |  |  |  |  |  |  |
Unsecured 3.45% senior notes due November 15, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  | $ 300,000 |  | $ 300,000 |  |  |  |  |  |  | $ 300,000 |
Debt, interest rate |  |  | 3.45% |  | 3.45% |  |  |  |  |  |  | 3.45% |
Debt, due date |  |  | Nov. 15, 2022 |  | Nov. 15, 2022 |  |  |  |  |  |  |  |
Debt issuance costs, net of amortization |  |  | $ 600 |  | $ 900 |  |  |  |  |  |  |  |
Amortization of debt discount premium |  |  | $ 100 |  | $ 100 |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  | 3.465% |  | 3.465% |  |  |  |  |  |  |  |
Mark-to-market derivative asset |  |  | $ 1,300 |  | $ 300 |  |  |  |  |  |  |  |
Unsecured 3.75% notes due March 15, 2027 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  | $ 400,000 |  | $ 400,000 |  |  |  |  | $ 400,000 |  |  |
Debt, interest rate |  |  | 3.75% | [3] | 3.75% | [3] |  |  |  | 3.75% |  |  |
Debt, due date | [3] |  | Mar. 15, 2027 |  | Mar. 15, 2027 |  |  |  |  |  |  |  |
Debt issuance costs, net of amortization |  |  | $ 2,600 |  | $ 3,000 |  |  |  |  |  |  |  |
Amortization of debt discount premium |  |  | $ 300 |  | $ 400 |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  | 3.767% |  | 3.767% |  |  |  |  |  |  |  |
Unsecured 4.55% senior notes due March 1, 2029 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  | $ 350,000 |  | $ 350,000 |  | $ 350,000 |  |  |  |  |  |
Debt, interest rate |  |  | 4.55% | [4] | 4.55% | [4] | 4.55% |  |  |  |  |  |
Debt, due date | [4] |  | Mar. 01, 2029 |  | Mar. 01, 2029 |  |  |  |  |  |  |  |
Debt issuance costs, net of amortization |  |  | $ 3,000 |  | $ 3,500 |  |  |  |  |  |  |  |
Amortization of debt discount premium |  |  | $ 500 |  | $ 500 |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  | 4.568% |  | 4.568% |  |  |  |  |  |  |  |
Unsecured 5.25% notes due June 1, 2045 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  | $ 50,000 | $ 250,000 |  |
Debt, interest rate |  |  | 5.25% | [5] | 5.25% | [5] |  |  |  | 5.25% | 5.25% |  |
Debt, due date | [5] |  | Jun. 01, 2045 |  | Jun. 01, 2045 |  |  |  |  |  |  |  |
Debt issuance costs, net of amortization |  |  | $ 2,900 |  | $ 3,000 |  |  |  |  |  |  |  |
Amortization of debt discount premium |  |  | $ 1,400 |  | $ 1,400 |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  | 5.29% |  | 5.29% |  |  |  |  |  |  |  |
Accounts Receivable Securitization Program with Two Banks, through May 21, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, due date |  |  | May 21, 2021 |  | May 21, 2021 |  |  |  |  |  |  |  |
Debt issuance costs, net of amortization |  |  | $ 200 |  | $ 100 |  |  |  |  |  |  |  |
Other Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, maturity year |  |  | 2021 |  | 2021 |  |  |  |  |  |  |  |
Unsecured 4.25% notes due January 15, 2048 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  | $ 300,000 |  | $ 300,000 |  |  | $ 300,000 |  |  |  |  |
Debt, interest rate |  |  | 4.25% | [6] | 4.25% | [6] |  | 4.25% |  |  |  |  |
Debt, due date | [6] |  | Jan. 15, 2048 |  | Jan. 15, 2048 |  |  |  |  |  |  |  |
Debt issuance costs, net of amortization |  |  | $ 3,400 |  | $ 3,500 |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  | 4.25% |  | 4.25% |  |  |  |  |  |  |  |
United States Dollar Denominated Debt | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding debt |  |  | $ 218,281 |  | $ 14,268 |  |  |  |  |  |  |  |
United States Dollar Denominated Debt | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Average interest rate |  |  | 1.5505% |  | 3.6805% |  |  |  |  |  |  |  |
Australian Dollar Denominated Debt | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding debt |  |  | $ 37,199 |  | $ 34,558 |  |  |  |  |  |  |  |
Australian Dollar Denominated Debt | Revolving Credit Facility | Australian Bank Bill Swap Bid Rate |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Average interest rate |  |  | 1.465% |  | 2.69% |  |  |  |  |  |  |  |
Canadian Dollar Denominated Debt | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding debt |  |  |  |  | $ 131,738 |  |  |  |  |  |  |  |
Canadian Dollar Denominated Debt | Revolving Credit Facility | CDOR |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Average interest rate |  |  |  |  | 3.23% |  |  |  |  |  |  |  |
Euro Denominated Debt | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding debt |  |  | $ 167,537 |  | $ 159,745 |  |  |  |  |  |  |  |
Euro Denominated Debt | Revolving Credit Facility | EUR LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Average interest rate |  |  | 1.375% |  | 1.25% |  |  |  |  |  |  |  |
Initial Aggregate Principal | Unsecured 6.125% senior notes due October 15, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  | $ 300,000 |  | $ 300,000 |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  | 6.139% |  |  |  |  |  |  |  |  |  |
Initial Aggregate Principal | Unsecured 5.25% notes due June 1, 2045 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  | $ 250,000 |  | 250,000 |  |  |  |  |  |  |  |
Additional Aggregate Principal | Unsecured 6.125% senior notes due October 15, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  | 150,000 |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 4.934%
Unamortization of debt premium |  |  |  |  | 700 |  |  |  |  |  |  |  |
Additional Aggregate Principal | Unsecured 5.25% notes due June 1, 2045 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  | $ 50,000 |  |  |  |  |  | $ 50,000 |  |  |  |
Debt instrument, effective interest rate |  |  | 4.839% |  |  |  |  |  | 4.839% |  |  |  |
Unamortization of debt premium |  |  | $ 2,900 |  | $ 3,000 |  |  |  |  |  |  |  |
[1] | 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.
[2] | Includes the combination of the October 2009 initial issuance of $300.0 million aggregate principal amount and the May 2011 issuance of an additional $150.0 million aggregate principal amount of these notes. The effective interest rate on the notes issued in October 2009, including the amortization of the discount, was 6.139%. The additional $150.0 million aggregate principal amount of the notes due 2019 issued in May 2011 was adjusted for the unamortized premium received at issuance, which approximated $0.7 million at May 31, 2019. The premium effectively increased the proceeds from the financing. The effective interest rate on the $150.0 million notes issued in May 2011 is 4.934%. At May 31, 2019, the notes were adjusted for debt issuance costs, net of amortization, for approximately $0.2 million. During the second quarter of fiscal 2020, we used funds from our revolving credit facility to pay off our $450 million, 6.125% notes due in October 2019.
[3] | 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.
[4] | 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.
[5] | 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.
[6] | The $300.0 million face amount of the notes due 2048 is adjusted for the debt issuance cost, net of amortization, which approximated $3.4 million and $3.5 million at May 31, 2020 and 2019, respectively. The effective interest rate on the notes is 4.25%.

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