Cash Equivalents and Investments (Available-for-Sale Securities) (Details) - USD ($) $ in Millions	Oct. 31, 2024	Jul. 31, 2024
Debt Securities, Available-for-sale
Amortized Cost	$ 5,541.3
Fair Value	5,565.6
Cash equivalents:
Debt Securities, Available-for-sale
Amortized Cost	337.7	$ 467.4
Unrealized Gains	0.0	0.0
Unrealized Losses	0.0	0.0
Fair Value	337.7	467.4
Cash equivalents: \| Commercial paper
Debt Securities, Available-for-sale
Amortized Cost	228.7	299.6
Unrealized Gains	0.0	0.0
Unrealized Losses	0.0	0.0
Fair Value	228.7	299.6
Cash equivalents: \| Corporate debt securities
Debt Securities, Available-for-sale
Amortized Cost	34.2	18.2
Unrealized Gains	0.0	0.0
Unrealized Losses	0.0	0.0
Fair Value	34.2	18.2
Cash equivalents: \| U.S. government and agency securities
Debt Securities, Available-for-sale
Amortized Cost	74.8	149.6
Unrealized Gains	0.0	0.0
Unrealized Losses	0.0	0.0
Fair Value	74.8	149.6
Investments:
Debt Securities, Available-for-sale
Amortized Cost	5,203.6	5,188.9
Unrealized Gains	32.9	35.4
Unrealized Losses	(8.6)	(7.5)
Fair Value	5,227.9	5,216.8
Investments: \| Corporate debt securities
Debt Securities, Available-for-sale
Amortized Cost	4,115.2	4,065.5
Unrealized Gains	25.3	28.3
Unrealized Losses	(7.8)	(6.6)
Fair Value	4,132.7	4,087.2
Investments: \| U.S. government and agency securities
Debt Securities, Available-for-sale
Amortized Cost	21.9	21.9
Unrealized Gains	0.0	0.0
Unrealized Losses	0.0	(0.2)
Fair Value	21.9	21.7
Investments: \| Certificates of deposit
Debt Securities, Available-for-sale
Amortized Cost	15.7	20.6
Unrealized Gains	0.0	0.0
Unrealized Losses	0.0	0.0
Fair Value	15.7	20.6
Investments: \| Commercial paper
Debt Securities, Available-for-sale
Amortized Cost	36.1	79.9
Unrealized Gains	0.0	0.1
Unrealized Losses	0.0	(0.1)
Fair Value	36.1	79.9
Investments: \| Non-U.S. government and agency securities
Debt Securities, Available-for-sale
Amortized Cost	38.6	57.9
Unrealized Gains	0.5	0.7
Unrealized Losses	0.0	0.0
Fair Value	39.1	58.6
Investments: \| Asset-backed securities
Debt Securities, Available-for-sale
Amortized Cost	976.1	943.1
Unrealized Gains	7.1	6.3
Unrealized Losses	(0.8)	(0.6)
Fair Value	$ 982.4	$ 948.8

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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