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Stockholders' Equity - Schedule of Accumulated Other Comprehensive (Loss) Income (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 30, 2021
Oct. 31, 2020
Oct. 30, 2021
Oct. 31, 2020
Net Unrealized Gains on Available-for-Sale Debt Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive loss (income), before reclassification tax $ 1.6 $ 0.2 $ 2.4 $ (1.5)
Accumulated Other Comprehensive (Loss) Income [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive loss (income), tax $ 0.2 $ 0.0 $ 0.4 $ (0.4)