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Borrowings - Additional Information (Detail) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 20, 2017 | May 09, 2014 | Dec. 09, 2013 | Nov. 30, 2018 | May 31, 2019 | May 31, 2018 | May 31, 2015 | Feb. 27, 2019 | Mar. 02, 2017 | May 29, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long-term debt in 2020 |  |  |  |  |  | $ 552,400,000 |  |  |  |  |  |  |
Maturities of long-term debt in 2021 |  |  |  |  |  | 100,000 |  |  |  |  |  |  |
Maturities of long-term debt in 2022 |  |  |  |  |  | 100,000 |  |  |  |  |  |  |
Maturities of long-term debt in 2023 |  |  |  |  |  | 299,300,000 |  |  |  |  |  |  |
Maturities of long-term debt in 2024 |  |  |  |  |  | 336,400,000 |  |  |  |  |  |  |
Maturities of long-term debt thereafter |  |  |  |  |  | 1,337,600,000 |  |  |  |  |  |  |
Credit facility, available liquidity |  |  |  |  |  | 1,059,100,000 |  |  |  |  |  |  |
Liquidity available |  |  |  |  |  | $ 1,280,000,000 |  |  |  |  |  |  |
Consolidated indebtedness |  |  |  |  |  | 64.20% |  | 57.10% |  |  |  |  |
Issuance of note |  |  |  |  |  | $ 205,000,000 |  | $ 205,000,000 |  |  |  |  |
Credit facility borrowing potential maximum capacity |  |  |  |  |  | 1,500,000,000 |  |  |  |  |  |  |
Outstanding balance on senior notes including amortizable cost |  |  |  |  |  | 2,525,908,000 |  | $ 2,174,144,000 |  |  |  |  |
Outstanding balance |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Margin |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  |  |  |  |  | 0.80% |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, available liquidity |  |  |  |  |  | $ 959,100,000 |  |  |  |  |  |  |
Unsecured senior notes , maturity date | [1] |  |  |  |  | Oct. 31, 2023 |  | Oct. 31, 2023 |  |  |  |  |
Credit facility borrowing maximum capacity |  |  |  |  | $ 1,300,000,000 |  |  |  |  | $ 800,000,000 |  |  |
Credit facility expiration date |  |  |  |  | Oct. 31, 2023 |  |  |  |  | Dec. 05, 2019 |  |  |
Outstanding balance on senior notes including amortizable cost | [1] |  |  |  |  | $ 336,442,000 |  | $ 235,774,000 |  |  |  |  |
Interest coverage ratio |  |  |  |  |  | 746.00% |  |  |  |  |  |  |
Leverage ratio |  |  |  |  |  | 315.00% |  |  |  |  |  |  |
Unsecured 4.55% senior notes due March 1, 2029 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of note |  |  |  |  |  | $ 350,000,000 |  |  |  |  | $ 350,000,000 |  |
Debt, interest rate |  |  |  |  |  | 4.55% | [2] |  |  |  | 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 | [2] |  |  |  |  | Mar. 01, 2029 |  |  |  |  |  |  |
Outstanding balance on senior notes including amortizable cost | [2] |  |  |  |  | $ 346,006,000 |  |  |  |  |  |  |
Unsecured 4.25% notes due January 15, 2048 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of note |  | $ 300,000,000 |  |  |  | $ 300,000,000 |  |  |  |  |  |  |
Debt, interest rate |  | 4.25% |  |  |  | 4.25% | [3] | 4.25% | [3] |  |  |  |
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 | [3] |  |  |  |  | Jan. 15, 2048 |  | Jan. 15, 2048 |  |  |  |  |
Outstanding balance on senior notes including amortizable cost | [3] |  |  |  |  | $ 296,467,000 |  | $ 296,344,000 |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Unsecured 5.25% notes due June 1, 2045 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of note |  |  |  |  |  | $ 250,000,000 |  | $ 250,000,000 |  |  |  | $ 50,000,000 | $ 250,000,000
Debt, interest rate |  |  |  |  |  | 5.25% | [4] | 5.25% | [4] |  |  | 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 | [4] |  |  |  |  | Jun. 01, 2045 |  | Jun. 01, 2045 |  |  |  |  |
Outstanding balance on senior notes including amortizable cost | [4] |  |  |  |  | $ 298,589,000 |  | $ 298,514,000 |  |  |  |  |
Unsecured 3.75% notes due March 15, 2027 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of note |  |  |  |  |  | $ 400,000,000 |  | $ 400,000,000 |  |  |  | $ 400,000,000 |
Debt, interest rate |  |  |  |  |  | 3.75% | [5] | 3.75% | [5] |  |  | 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 | [5] |  |  |  |  | Mar. 15, 2027 |  | Mar. 15, 2027 |  |  |  |  |
Outstanding balance on senior notes including amortizable cost | [5] |  |  |  |  | $ 396,586,000 |  | $ 396,110,000 |  |  |  |  |
Unsecured 6.125% senior notes due October 15, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, interest rate | [6] |  |  |  |  | 6.125% |  | 6.125% |  |  |  |  |
Unsecured senior notes , maturity date | [6] |  |  |  |  | Oct. 15, 2019 |  | Oct. 15, 2019 |  |  |  |  |
Outstanding balance on senior notes including amortizable cost | [6] |  |  |  |  | $ 450,454,000 |  | $ 451,658,000 |  |  |  |  |
Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant leverage ratio |  |  |  |  |  | 425.00% |  |  |  |  |  |  |
Issuance of Debt | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant leverage ratio |  |  |  |  |  | 375.00% |  |  |  |  |  |  |
Aggregate consideration for acquisition |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |
Interest coverage ratio |  |  |  |  |  | 350.00% |  |  |  |  |  |  |
Accounts Receivable Securitization Program with Two Banks, through May 8, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes , maturity date |  |  |  |  |  | May 08, 2020 |  |  |  |  |  |  |
Credit facility borrowing maximum capacity |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |
Credit facility expiration date |  |  | May 08, 2020 |  |  |  |  |  |  |  |  |  |
Outstanding balance on senior notes including amortizable cost | [7] |  |  |  |  | $ 99,887,000 |  |  |  |  |  |  |
Percentage of indirect economic interest held in SPE |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Accounts Receivable Securitization Program with Two Banks, through May 8, 2020 | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly unused commitment fee |  |  |  |  |  | 0.50% |  |  |  |  |  |  |
Accounts Receivable Securitization Program with Two Banks, through May 8, 2020 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly unused commitment fee |  |  |  |  |  | 0.30% |  |  |  |  |  |  |
Unsecured 2.25% senior convertible notes due December 15, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of note |  |  |  |  |  | $ 205,000,000 |  |  |  |  |  |  |
Debt, interest rate |  |  |  |  |  |  |  | 2.25% |  |  |  |  |
Unsecured senior notes , maturity date |  |  |  |  |  |  |  | Dec. 15, 2020 |  |  |  |  |
Outstanding balance on senior notes including amortizable cost |  |  |  |  |  |  |  | $ 196,865,000 |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  |  | 100.00% |  |  |  |  |  |  |
Debt instrument, conversion rate |  |  |  |  |  | 19,221.062 |  |  |  |  |  |  |
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% senior convertible notes due December 15, 2020 | Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of note |  |  |  | $ 205,000,000 |  |  |  |  |  |  |  |  |
[1] | 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). Interest was tied to AUD at May 31, 2018, and averaged 2.925% for AUD denominated debt ($23,309) and 0.675% on EUR denominated debt ($213,708). At May 31, 2019 and 2018, the revolving credit facility is adjusted for debt issuance costs, net of amortization, for approximately $3.9 million and $1.2 million, respectively.
[2] | 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, 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, 2019, the notes were adjusted for debt issuance costs, net of amortization, for approximately $3.5 million.
[3] | The $300.0 million face amount of the notes due 2048 is adjusted for the debt issuance cost, net of amortization, which approximated $3.5 million and $3.6 million at May 31, 2019 and 2018, respectively. The effective interest rate on the notes is 4.25%.
[4] | 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, 2019 and 2018. 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 $3.0 million at May 31, 2019 and 2018. 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, 2019 and 2018, the notes are adjusted for debt issuance costs, net of amortization, for approximately $3.0 million and $3.1 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 $0.4 million and $0.5 million at May 31, 2019 and 2018, 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, 2019 and 2018, the notes are adjusted for debt issuance costs, net of amortization, for approximately $3.0 million and $3.4 million, respectively.
[6] | 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, is 6.139%. The additional $150.0 million aggregate principal amount of the notes due 2019 issued in May 2011 is adjusted for the unamortized premium received at issuance, which approximated $0.7 million and $2.3 million at May 31, 2019 and 2018, respectively. 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 and 2018, the notes are adjusted for debt issuance costs, net of amortization, for approximately $0.2 million and $0.6 million, respectively.
[7] | At May 31, 2019, the accounts receivable securitization program is adjusted for debt issuance cost, net of amortization, for approximately $0.1 million.

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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