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Acquisitions, Disposals and Other Transactions (Details)	3 Months Ended
	Sep. 30, 2026 USD ($) business	Sep. 30, 2025 business	Jun. 30, 2026 USD ($)	Jun. 14, 2026 USD ($) $ / shares
Business Combination [Line Items]
Number of businesses acquired \| business	0	0
Term Loan Agreement \| Line of Credit \| Secured Debt
Business Combination [Line Items]
Debt instrument, face amount	$ 1,000,000,000.0
Roku TV Streaming Platform
Business Combination [Line Items]
Business combination, consideration transferred, equity interests issued and issuable, cash paid per acquiree share (in dollars per share) \| $ / shares				$ 96.00
Business combination, consideration transferred, equity interests issued and issuable, entity shares issued per acquiree share (in dollars per share) \| $ / shares				$ 0.9693
Business combination, termination fee payable upon change in board recommendation				$ 866,000,000
Business combination, termination fee payable upon failure to obtain approval				$ 1,200,000,000
Roku TV Streaming Platform \| Fully Committed Bridge Financing
Business Combination [Line Items]
Debt instrument, face amount			$ 12,000,000,000.0
Roku TV Streaming Platform \| Senior Unsecured Bridge Facility \| Bridge Loan
Business Combination [Line Items]
Debt instrument, face amount	$ 11,000,000,000.0
Roku TV Streaming Platform \| Term Loan Agreement \| Line of Credit \| Secured Debt
Business Combination [Line Items]
Debt instrument, face amount			$ 1,000,000,000.0