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Related Party Transactions (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2025
Feb. 28, 2023
Jun. 30, 2026
Jun. 30, 2025
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2022
Related Party Transaction [Line Items]              
Revenue     $ 1,289,000,000 $ 1,053,000,000      
Operating expenses     1,162,000,000 909,000,000      
Other current liabilities     696,000,000   $ 447,000,000    
Contract liabilities current     200,000,000   294,000,000    
Contract liabilities noncurrent     739,000,000   752,000,000    
Additional (reversal of) provision     0 (1,000,000)      
Accounts receivable, allowance     31,000,000 19,000,000 31,000,000 $ 20,000,000  
Contract asset, current     881,000,000   977,000,000    
Contract asset, noncurrent     366,000,000   320,000,000    
Accounts receivable, net     1,119,000,000   1,300,000,000    
Proceeds from equity method investments     800,000 1,800,000      
Related Party              
Related Party Transaction [Line Items]              
Revenue     388,000,000 328,000,000      
Operating lease, lease income, lease payments     300,000 200,000      
Other current liabilities     30,000,000   20,000,000    
Contract liabilities current     29,000,000   36,000,000    
Contract liabilities noncurrent     23,000,000   23,000,000    
Contract asset, current     577,000,000   646,000,000    
Accounts receivable, net     281,000,000   270,000,000    
Related Party | Arduino              
Related Party Transaction [Line Items]              
Loan receivable, noncurrent           $ 16,600,000  
Proceeds from settlement of loans, including convertible loans $ 16,900,000            
Loan receivable, credit loss reversal         16,800,000    
Related Party | Cerfe Labs, Inc. | Loans receivable              
Related Party Transaction [Line Items]              
Loans receivable, gross, noncurrent     3,200,000   3,200,000    
IP Licensing Revenue | Related Party              
Related Party Transaction [Line Items]              
Revenue     189,400,000 201,000,000.0      
Net receivable     283,500,000   276,200,000    
Accounts receivable, before allowance for credit loss, current     308,300,000   296,500,000    
Other current liabilities     24,800,000   20,300,000    
Contract liabilities current     29,000,000.0   30,300,000    
Contract liabilities noncurrent     23,300,000   23,300,000    
Additional (reversal of) provision     0 0      
Accounts receivable, allowance     28,300,000   28,300,000    
Service Share Arrangement | Related Party              
Related Party Transaction [Line Items]              
Operating expenses     17,200,000 13,900,000      
Contract termination costs     6,800,000        
Common Control in SoftBank | Related Party              
Related Party Transaction [Line Items]              
Revenue     192,900,000 126,100,000      
Contract asset, current     576,100,000   645,800,000    
Contract asset, noncurrent     1,100,000   0    
Common Control in SoftBank | Related Party | Ampere              
Related Party Transaction [Line Items]              
Revenue     5,400,000 600,000      
Other Equity Investments | Related Party              
Related Party Transaction [Line Items]              
Contract liabilities current     400,000   5,400,000    
Contract asset, current     500,000   500,000    
Operating costs and expenses     5,000,000.0        
Prepaid expense     5,000,000.0        
Accounts payable     5,000,000.0        
Accounts receivable, net     $ 0   $ 500,000    
Linaro Agreement | Related Party              
Related Party Transaction [Line Items]              
Subscription costs incurred       $ 2,300,000      
Amounts of transaction   $ 4,000,000.0          
Related party transaction, term   5 years          
Acetone Limited              
Related Party Transaction [Line Items]              
Ownership percentage             10.00%
Arm China | Acetone Limited              
Related Party Transaction [Line Items]              
Ownership percentage             48.20%