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%.