v3.26.1
Ordinary Shares - Additional Information (Details)
12 Months Ended
Sep. 30, 2025
Apr. 30, 2026
€ / shares
Apr. 30, 2026
USD ($)
shares
Oct. 31, 2025
USD ($)
Aug. 21, 2025
Apr. 30, 2025
€ / shares
shares
Class of Stock [Line Items]            
Ordinary shares, shares authorized (in shares)     165,000,000     165,000,000
Ordinary shares, par value (in € / shares) | € / shares   € 0.01       € 0.01
Ordinary shares, voting rights   one vote per ordinary share        
Dividends declared | $     $ 0      
Rights to acquire ordinary shares, authorized percentage of issued share capital         20.00%  
Rights to acquire ordinary shares, authorized period 18 months          
Preferred shares, voting rights   one vote per preference share        
Share repurchase program, authorized amount | $       $ 500,000,000.0    
Amount remaining available for future share repurchases | $     $ 160,000,000.0      
Convertible Preference Shares            
Class of Stock [Line Items]            
Preference shares, shares authorized (in shares)     165,000,000     165,000,000
Preference shares, shares issued (in shares)     0     0
Preference shares, shares outstanding (in shares)     0     0
Maximum            
Class of Stock [Line Items]            
Ordinary shares, par value (in € / shares) | € / shares   € 0.01