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Debt - Long-term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Oct. 31, 2016	Aug. 31, 2015	Jun. 30, 2015	Sep. 30, 2014	Dec. 31, 2011
Debt Instrument [Line Items]
Less: Debt issuance costs	$ (6,007)		$ (7,350)
Total debt, net	2,413,725		2,768,741
Less: Current portion, net	(132,284)		(497,449)
Total long-term debt, net	2,281,441		$ 2,271,292
Interest rate on senior notes			6.30%	1.53%
U.S. dollar 3.73% senior notes due September 2024
Debt Instrument [Line Items]
Total debt, gross	300,000		$ 300,000
Interest rate on senior notes							3.73%
U.S. dollar 3.91% senior notes due June 2025
Debt Instrument [Line Items]
Total debt, gross	50,000		50,000
Interest rate on senior notes						3.91%
U.S. dollar 3.96% senior notes due August 2025
Debt Instrument [Line Items]
Total debt, gross	100,000		100,000
Interest rate on senior notes					3.96%
U.S. dollar 4.18% senior notes due December 2025
Debt Instrument [Line Items]
Total debt, gross	$ 275,000		275,000
Interest rate on senior notes	4.18%
U.S. dollar 3.83% senior notes due September 2026
Debt Instrument [Line Items]
Total debt, gross	$ 100,000		100,000
Interest rate on senior notes							3.83%
U.S. dollar 4.32% senior notes due December 2027
Debt Instrument [Line Items]
Total debt, gross	$ 250,000		250,000
Interest rate on senior notes	4.32%
U.S. dollar 4.37% senior notes due December 2028
Debt Instrument [Line Items]
Total debt, gross	$ 50,000		50,000
Interest rate on senior notes	4.37%
U.S. dollar 3.98% senior notes due September 2029
Debt Instrument [Line Items]
Total debt, gross	$ 100,000		100,000
Interest rate on senior notes							3.98%
U.S. dollar 4.45% senior notes due August 2035
Debt Instrument [Line Items]
Total debt, gross	50,000		50,000
Interest rate on senior notes					4.45%
British pound 4.68% senior note due September 2020
Debt Instrument [Line Items]
Total debt, gross	0		106,140
Interest rate on senior notes		4.68%
British pound 2.59% senior note due November 2028
Debt Instrument [Line Items]
Total debt, gross	$ 204,880		199,011
Interest rate on senior notes	2.59%
British pound 2.70% senior note due November 2031
Debt Instrument [Line Items]
Total debt, gross	$ 102,433		99,508
Interest rate on senior notes	2.70%
Euro 1.34% senior notes due October 2026
Debt Instrument [Line Items]
Total debt, gross	$ 366,806		336,797
Interest rate on senior notes	1.34%
Euro 1.71% senior notes due December 2027
Debt Instrument [Line Items]
Total debt, gross	$ 91,706		84,202
Interest rate on senior notes	1.71%
Euro 1.53% senior notes due October 2028
Debt Instrument [Line Items]
Total debt, gross	$ 244,572		224,553
Interest rate on senior notes	1.53%
Swiss franc 2.44% senior note due December 2021
Debt Instrument [Line Items]
Total debt, gross	$ 62,190		56,830
Interest rate on senior notes								2.44%
Revolving credit facility borrowings
Debt Instrument [Line Items]
Total debt, gross	72,145		384,816
Other, principally foreign
Debt Instrument [Line Items]
Total debt, gross	$ 0		$ 9,234

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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