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Common Stock and Stock-Based Compensation - Narrative (Details)
 1 Months Ended 12 Months Ended
Jan. 01, 2022
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Feb. 02, 2021
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Nov. 02, 2020
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$ / shares
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Oct. 02, 2020
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Sep. 30, 2020
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Oct. 31, 2017
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class
$ / shares
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Mar. 25, 2022
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Mar. 26, 2021
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Mar. 27, 2020
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Nov. 01, 2020
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Mar. 29, 2019
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Estimated offering costs | $             $ 1,790,000        
Number of classes of stock | class           2          
Common stock, shares authorized (in shares)             1,000,000,000 1,000,000,000      
Common stock, par value (in dollars per share) | $ / shares             $ 0.01 $ 0.01      
Stock repurchased during period, aggregate purchase price | $               $ 27,707,000      
Shares issued upon conversion, including shares withheld for tax withholding obligation (in shares)     166,500,000                
Common stock, shares outstanding (in shares)             190,473,595 189,588,161      
Shares issued upon conversion (in shares)     164,431,766                
Weighted average conversion price (in dollars per share) | $ / shares     $ 14.00                
Stock-based compensation | $             $ 33,548,000 $ 49,870,000 $ 1,435,000    
IPO                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares issued in transaction (in shares)   0 28,750,000                
Offering price (in dollars per share) | $ / shares     $ 14.00                
Net proceeds | $   $ 0 $ 321,425,000                
Underwriting discounts | $     20,125,000                
Estimated offering costs | $     $ 8,450,000                
Stock-based compensation | $               $ 40,440,000      
IPO | Allegro Microsystems, Inc.                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares issued in transaction (in shares)     25,000,000                
IPO - Selling Shareholders                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares issued in transaction (in shares)   19,332,852 3,750,000                
Shares Of Common Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares issued upon conversion (in shares)     163,972,017                
Shares Of Unvested Restricted Common Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares issued upon conversion (in shares)     459,749                
Restricted Stock Units (RSUs)                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Grants in period (in shares)             1,344,717 1,428,932      
Grant date fair value (in dollars per share) | $ / shares             $ 26.00 $ 14.06      
Stock-based compensation expense not yet recorded | $             $ 22,790,000        
Stock-based compensation expense not yet recorded, period for recognition             1 year 3 months 7 days        
Vested during period (in shares)             622,508 160,063      
Stock-based compensation | $     $ 1,028,000       $ 19,918,000 $ 5,729,000      
Outstanding balance (in shares)             1,701,007 1,225,156 0    
Weighted-average grant date fair value (in dollars per share) | $ / shares             $ 20.50 $ 14.07 $ 0    
Performance Stock Units (PSUs)                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Grants in period (in shares)             465,732 650,302      
Grant date fair value (in dollars per share) | $ / shares             $ 27.08 $ 15.05      
Stock-based compensation expense not yet recorded | $             $ 12,893,000        
Stock-based compensation expense not yet recorded, period for recognition             1 year 6 months 3 days        
Vested during period (in shares)             0 0      
Performance period             3 years        
Intrinsic value, vested | $             $ 27,869,000        
Stock-based compensation | $             $ 11,997,000 $ 1,269,000      
Outstanding balance (in shares)             955,083 650,302 0    
Weighted-average grant date fair value (in dollars per share) | $ / shares             $ 20.22 $ 15.05 $ 0    
Performance Stock Units (PSUs) | Minimum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Grant percentage of target shares granted maximum             0        
Inclusion percentage of target goals             100.00%        
Performance Stock Units (PSUs) | Maximum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Grant percentage of target shares granted maximum             2        
Inclusion percentage of target goals             200.00%        
Restricted Common Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Grants in period (in shares)               459,749      
Grant date fair value (in dollars per share) | $ / shares               $ 14.00      
Vested during period (in shares)             241,787 50,170      
Stock-based compensation | $             $ 424,000 $ 174,000      
Outstanding balance (in shares)             140,526 406,327 0    
Weighted-average grant date fair value (in dollars per share) | $ / shares             $ 14.00 $ 14.00 $ 0    
Employee Stock Purchase Plan (ESPP)                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock-based compensation expense not yet recorded | $             $ 272,000        
Stock-based compensation expense not yet recorded, period for recognition             3 months 7 days        
Common stock reserved for future issuance (in shares)     1,545,891                
Number of shares immediately available for grant (in shares)     832,400                
Number of shares that may become available for grant (in shares)     713,491                
Purchase price of common stock, percentage of fair market value     85.00%                
Offering period     6 months                
Stock-based compensation | $             $ 1,099,000 $ 247,000      
Phantom Stock Grants                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Grants in period (in shares) 5,733                    
Vested during period (in shares)             2.15        
Stock-based compensation | $             $ 110,000        
Common Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock repurchased during period (in shares)               2,068,274      
Stock repurchased during period, aggregate purchase price | $               $ 21,000      
Common stock, shares outstanding (in shares)             190,473,595 189,588,161 0   0
Common Stock, Class A                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares issued in transaction (in shares)           2,880,000          
Net proceeds | $           $ 291,000,000          
Estimated offering costs | $           $ 9,260,000          
Common stock, shares authorized (in shares)           12,500,000          
Common stock, par value (in dollars per share) | $ / shares           $ 0.01          
Issuance of common stock, gross (in shares)           6,720,000          
Priority dividend, percentage           0.08          
Payments of dividends | $         $ 400,000,000            
Grants in period (in shares)           400,000          
Vesting period           60 months          
Conversion rate     15.822                
Shares returned for tax payments made on behalf of holders of common stock (in shares)     2,066,468                
Shares issued upon conversion (in shares)     156,155,403                
Stock-based compensation | $     $ 40,440,000                
Common Stock, Class A | Shares Of Common Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares issued upon conversion (in shares)     156,155,403                
Common Stock, Class A | Shares Of Unvested Restricted Common Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares issued upon conversion (in shares)     0                
Common Stock, Class A | OEP                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Noncontrolling interest ownership percentage           28.80%          
Common Stock, Class A | If Initial Public Offering or Change in Control Occurs                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Accelerated vesting cost | $           $ 40,440,000          
Accelerated vesting, number (in shares)           400,000          
Accelerated vesting, share price (in dollars per share) | $ / shares           $ 101.10          
Common Stock, Class A | Common Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common stock, shares outstanding (in shares)             0 0 10,000,000   10,000,000
Common Stock,  Class L                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common stock, shares authorized (in shares)           1,000,000          
Common stock, par value (in dollars per share) | $ / shares           $ 0.01          
Grants in period (in shares)           597,400          
Vesting period           4 years          
Accelerated vesting, percentage     0.25                
Stock repurchased during period (in shares)       1,997              
Stock repurchased during period, aggregate purchase price | $       $ 408,000              
Conversion rate     13.010                
Shares returned for tax payments made on behalf of holders of common stock (in shares)     1,766                
Outstanding loan amounts extinguished | $       $ 753,000              
Common stock, shares outstanding (in shares)                   638,298  
Common stock, shares outstanding, weighted average price per share (in dollars per share) | $ / shares                   $ 11.99  
Shares issued upon conversion (in shares)     8,276,363                
Stock-based compensation | $     $ 1,610,000         $ 1,169,000      
Common Stock,  Class L | Shares Of Common Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares issued upon conversion (in shares)     7,816,614                
Common Stock,  Class L | Shares Of Unvested Restricted Common Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares issued upon conversion (in shares)     459,749                
Common Stock,  Class L | If Initial Public Offering Occurs                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Accelerated vesting, percentage           0.25          
Accelerated vesting, minimum percentage of awards unvested           0.25          
Common Stock,  Class L | If a Change in Control Occurs                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Accelerated vesting, percentage           1          
Common Stock,  Class L | Common Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares issued during period (in shares)               17,203 30,300    
Shares issued during period, weighted average price per share (in dollars per share) | $ / shares               $ 33.83 $ 26.93    
Stock repurchased during period (in shares)               1,997      
Common stock, shares outstanding (in shares)             0 0 622,470   607,620