Debt and Financing Arrangements (Details) - USD ($) $ in Millions		Apr. 30, 2023	Apr. 30, 2022
Long-term debt
Debt instrument face amount		$ 4,350.0	$ 4,350.0
Long-term debt	[1]	$ 4,314.2	$ 4,310.6
3.50% Senior Notes due March 15, 2025
Long-term debt
Interest rate on notes		3.50%	3.50%
Debt instrument face amount		$ 1,000.0	$ 1,000.0
Senior Notes	[1]	$ 998.4	$ 997.6
3.38% Senior Notes due December 15, 2027
Long-term debt
Interest rate on notes		3.38%	3.38%
Debt instrument face amount		$ 500.0	$ 500.0
Senior Notes	[1]	$ 498.0	$ 497.6
2.38% Senior Notes due March 15, 2030
Long-term debt
Interest rate on notes		2.38%	2.38%
Debt instrument face amount		$ 500.0	$ 500.0
Senior Notes	[1]	$ 496.7	$ 496.2
2.13% Senior Notes due March 15, 2032
Long-term debt
Interest rate on notes		2.13%	2.13%
Debt instrument face amount		$ 500.0	$ 500.0
Senior Notes	[1]	$ 494.4	$ 493.8
4.25% Senior Notes due March 15, 2035
Long-term debt
Interest rate on notes		4.25%	4.25%
Debt instrument face amount		$ 650.0	$ 650.0
Senior Notes	[1]	$ 645.1	$ 644.7
2.75% Senior Notes due September 15, 2041
Long-term debt
Interest rate on notes		2.75%	2.75%
Debt instrument face amount		$ 300.0	$ 300.0
Senior Notes	[1]	$ 297.3	$ 297.1
4.38% Senior Notes due March 15, 2045
Long-term debt
Interest rate on notes		4.38%	4.38%
Debt instrument face amount		$ 600.0	$ 600.0
Senior Notes	[1]	$ 588.2	$ 587.6
3.55% Senior Notes due March 15, 2050
Long-term debt
Interest rate on notes		3.55%	3.55%
Debt instrument face amount		$ 300.0	$ 300.0
Senior Notes	[1]	$ 296.1	$ 296.0

[1] Represents the carrying amount included in the Consolidated Balance Sheets, which includes the impact of capitalized debt issuance costs, offering discounts, and terminated interest rate contracts.