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Stockholders' Equity - Estimated Fair Value of PSUs, Valuation Assumptions (Details) - Performance stock units
3 Months Ended 12 Months Ended
Mar. 28, 2020
$ / shares
Dec. 28, 2019
$ / shares
Dec. 29, 2018
$ / shares
Dec. 30, 2017
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Index volatility     33.00% 33.00%
Infinera volatility, minimum   64.00% 58.00% 55.00%
Infinera volatility, maximum   68.00% 59.00% 56.00%
Estimated fair value (in dollars per share) $ 5.89      
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate   2.17% 2.37% 1.41%
Correlation with index/index component     0.04 0.10
Estimated fair value (in dollars per share)   $ 2.08 $ 14.99 $ 15.23
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Index volatility       34.00%
Risk-free interest rate   2.48% 2.40% 1.63%
Correlation with index/index component     0.48 0.49
Estimated fair value (in dollars per share)   $ 2.89 $ 19.46 $ 17.35