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Common Stock and Stock-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
Nov. 02, 2020
USD ($)
$ / shares
shares
Oct. 02, 2020
USD ($)
shares
Oct. 31, 2017
USD ($)
class
$ / shares
shares
Dec. 25, 2020
USD ($)
$ / shares
shares
Dec. 27, 2019
USD ($)
shares
Nov. 01, 2020
$ / shares
shares
Dec. 25, 2020
USD ($)
$ / shares
shares
Dec. 27, 2019
USD ($)
$ / shares
shares
Sep. 25, 2020
shares
Mar. 27, 2020
$ / shares
shares
Sep. 27, 2019
shares
Mar. 29, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Number of classes of stock | class     2                  
Common stock, shares authorized (in shares)       1,000,000,000     1,000,000,000     0    
Common stock, par value (in dollars per share) | $ / shares       $ 0.01     $ 0.01     $ 0.01    
Stock repurchased during period, aggregate purchase price | $       $ 27,707     $ 27,707          
Shares issued upon conversion, including shares withheld for tax withholding obligation (in shares) 166,500,000                      
Common stock, shares outstanding (in shares)       189,431,726     189,431,726     0    
Shares issued upon conversion (in shares) 164,431,726                      
Weighted average conversion price (in dollars per share) | $ / shares $ 14.00                      
Stock-based compensation | $       $ 45,876 $ 303   $ 46,901 $ 1,051        
IPO                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Number of shares issued in transaction (in shares) 28,750,000                      
Offering price (in dollars per share) | $ / shares $ 14.00                      
Net proceeds | $ $ 321,425                      
Underwriting discounts | $ 20,125                      
Estimated offering costs | $ $ 8,450                      
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) 3,750,000                      
LTIP | RSU Conversion Program                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock-based compensation | $ $ 607                      
TRIP | RSU Conversion Program                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock-based compensation | $ $ 421                      
Shares of Common Stock                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Shares issued upon conversion (in shares) 163,971,977                      
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)             1,426,944          
Stock-based compensation | $ $ 1,028     2,131     $ 2,131          
Grant date fair value (in dollars per share) | $ / shares             $ 14.04          
Stock-based compensation expense not yet recorded | $       17,496     $ 17,496          
Stock-based compensation expense not yet recorded, period for recognition             1 year 8 months 26 days          
Vested during period (in shares)             376          
Restricted Stock Units (RSUs) | Share-based Payment Arrangement, Nonemployee                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Grants in period (in shares)             54,644          
Restricted Stock Units (RSUs) | RSU Conversion Program                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Grant date fair value (in dollars per share) | $ / shares $ 14.00                      
Restricted Stock Units (RSUs) | LTIP | RSU Conversion Program                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Grants in period (in shares) 602,490                      
Restricted Stock Units (RSUs) | TRIP | RSU Conversion Program                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Grants in period (in shares) 348,911                      
Performance Stock Units (PSUs)                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Grants in period (in shares)             650,302          
Stock-based compensation | $       467     $ 467          
Grant date fair value (in dollars per share) | $ / shares             $ 15.05          
Stock-based compensation expense not yet recorded | $       $ 9,320     $ 9,320          
Stock-based compensation expense not yet recorded, period for recognition             2 years 10 months 24 days          
Performance period             3 years          
Vested during period (in shares)             0          
Intrinsic value, vested | $             $ 16,121          
Performance Stock Units (PSUs) | Minimum                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Grant percentage of target shares granted maximum       0     0          
Inclusion percentage of target goals       100.00%     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     2          
Inclusion percentage of target goals       200.00%     200.00%          
Restricted Common Stock                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Grants in period (in shares)             459,749          
Stock-based compensation | $       $ 73     $ 73          
Grant date fair value (in dollars per share) | $ / shares             $ 14.00          
Vested during period (in shares)             37,161          
Common Stock                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Issuance of common shares (in shares)       25,000,000     25,000,000          
Stock repurchased during period (in shares)       2,068,274     2,068,274          
Stock repurchased during period, aggregate purchase price | $       $ 21     $ 21          
Common stock, shares outstanding (in shares)       189,431,726     189,431,726   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                  
Estimated offering costs | $     $ 9,260                  
Common stock, shares authorized (in shares)     12,500,000 0     0     12,500,000    
Common stock, par value (in dollars per share) | $ / shares     $ 0.01 $ 0.01     $ 0.01     $ 0.01    
Issuance of common shares (in shares)     6,720,000                  
Priority dividend, percentage     0.08                  
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) 2,066,508                      
Common stock, shares outstanding (in shares)       0     0     10,000,000    
Shares issued upon conversion (in shares) 156,155,403                      
Stock-based compensation | $ $ 40,440                      
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                  
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 10,000,000   0 10,000,000 10,000,000 10,000,000 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 0     0     1,000,000    
Common stock, par value (in dollars per share) | $ / shares     $ 0.01 $ 0.01     $ 0.01     $ 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                    
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                    
Common stock, shares outstanding (in shares)       0   638,298 0     622,470    
Common stock, shares outstanding, weighted average price per share (in dollars per share) | $ / shares           $ 11.99            
Shares issued upon conversion (in shares) 8,276,323                      
Stock-based compensation | $ $ 1,610     $ 144     $ 1,169          
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) 7,816,574                      
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]                        
Issuance of common shares (in shares)           17,203 15,828 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     1,997          
Common stock, shares outstanding (in shares)       0 607,620   0 607,620 638,298 622,470 607,620 607,620