v3.26.1
Stockholders' equity (Details)
 4 Months Ended 8 Months Ended 12 Months Ended
Dec. 08, 2025
shares
Oct. 07, 2021
Vote
$ / shares
shares
Jun. 30, 2026
USD ($)
shares
Sep. 30, 2025
USD ($)
shares
Jun. 30, 2026
$ / shares
shares
Jun. 30, 2025
$ / shares
shares
Jun. 30, 2024
$ / shares
May 07, 2026
USD ($)
yr
$ / shares
shares
Mar. 04, 2026
USD ($)
Dec. 02, 2025
$ / shares
shares
Jan. 21, 2025
USD ($)
Class of Stock [Line Items]                      
Share repurchase program, authorized, number of shares                   39,699,102  
Sale of stock, price per share | $ / shares                   $ 41.12  
Sale of stock, shares issued (in shares) 39,699,102                    
Dividends declared (in USD per share) | $ / shares         $ 0 $ 0 $ 0        
NVIDIA Investment Rights                      
Class of Stock [Line Items]                      
Rights to acquire (in shares)               30,000,000      
Ordinary shares at an exercise price (in USD per share) | $ / shares               $ 70.00      
Fair value of the investment rights | $               $ 793,400,000      
NVIDIA Investment Rights | Expected volatility                      
Class of Stock [Line Items]                      
Rights outstanding, measurement input               0.675      
NVIDIA Investment Rights | Measurement Input, Expected Term                      
Class of Stock [Line Items]                      
Rights outstanding, measurement input | yr               5      
NVIDIA Investment Rights | Risk free interest rate                      
Class of Stock [Line Items]                      
Rights outstanding, measurement input               0.0396      
NVIDIA Investment Rights | Measurement Input, Discount for Lack of Marketability                      
Class of Stock [Line Items]                      
Rights outstanding, measurement input               0.15      
Management and Podtech Innovation Inc                      
Class of Stock [Line Items]                      
Issuance of ordinary shares (in shares)         516,951 842,291          
At the market facility                      
Class of Stock [Line Items]                      
Maximum value of shares to be issued under share sale option agreement | $                 $ 6,000,000,000   $ 1,000,000,000
Shares issued under facility (in shares)     47,165,838 66,707,732 47,165,838            
Proceeds from issuance of common stock under facility | $     $ 2,492,057,000 $ 999,999,452              
Ordinary shares                      
Class of Stock [Line Items]                      
Common stock, shares outstanding (in shares)     380,710,559   380,710,559 258,103,209          
Class B common stock                      
Class of Stock [Line Items]                      
Common stock, shares outstanding (in shares)     2   2 2          
Class B common stock | Entities controlled by executive directors Daniel and William Roberts                      
Class of Stock [Line Items]                      
Issuance of ordinary shares (in shares)   1                  
Price shares issued (in AUD per share) | $ / shares   $ 1.00                  
Number of votes | Vote   15                  
Period for B class share votes   12 years