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Overview and Summary of Significant Accounting Policies (Details) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended				9 Months Ended
	Apr. 30, 2025 USD ($) shares	Mar. 31, 2025 USD ($) $ / shares shares	Sep. 30, 2025 USD ($)	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($) $ / shares	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) segment	Sep. 30, 2024 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Payments of stock issuance costs							$ 28,769	$ 0
Compensation expense			$ 144,431			$ 7,617	473,409	23,466
Tax withholdings on settlement of shares			11,485	$ 92,541	$ 15,685
Conversion ratio		20
Research and development expense			93,000			$ 14,000	$ 243,000	$ 35,000
Number of operating segments | segment							1
Number of reportable segments | segment							1
Line of Credit | DDTL 2.0 Facility
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Restricted cash, current	$ 500,000	$ 500,000			$ 500,000
IPO
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Compensation expense		177,000
Capitalized costs		$ 17,000
Tax withholdings on settlement of restricted stock units (in shares) | shares		392,135
Shares issued (in shares) | shares		518,785
Restricted cash, current			500,000				$ 500,000
Deferred offering costs			$ 31,000				$ 31,000
Common Class A | IPO
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Shares issued in transaction (in shares) | shares		36,590,000
Sale of stock price (usd per share) | $ / shares		$ 40.00			$ 40.00
Proceeds from sale of stock		$ 1,400,000
Payments of stock issuance costs		$ 31,000
Conversion of stock, shares issued (in shares) | shares		155,111,700
Tax withholdings on settlement of shares		$ 16,000
Common Class A | Over-Allotment Option
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Shares issued in transaction (in shares) | shares	1,760,000
Proceeds from sale of stock	$ 68,000
Redeemable Class A Common Stock | IPO
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Conversion of stock, shares issued (in shares) | shares		29,874,066

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