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Summary of Stock Option Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended
Jul. 31, 2021
USD ($)
$ / shares
shares
Options  
Outstanding - beginning of period | shares 3,940
Granted | shares 449
Exercised | shares (771) [1]
Outstanding - end of period | shares 3,618
Vested and expected to vest - end of period | shares 2,778
Exercisable - end of period | shares 1,788 [2]
Weighted-Average Exercise Price  
Outstanding - beginning of period | $ / shares $ 14.87
Granted | $ / shares 32.58
Exercised | $ / shares 16.33 [1]
Outstanding - end of period | $ / shares 16.76
Vested and expected to vest - end of period | $ / shares 16.50
Exercisable - end of period | $ / shares $ 16.28 [2]
Weighted-Average Remaining Contractual Term (In years)  
Outstanding - end of period 4 years 10 months 24 days
Vested and expected to vest - end of period 3 years 6 months
Exercisable - end of period 2 years [2]
Outstanding - end of period | $ $ 64,071
Vested and expected to vest - end of period | $ 28,599
Exercisable - end of period | $ $ 32,531 [2]
[1]

Options exercised during the 26 weeks ended July 31, 2021 ranged in price from $8.62 to $21.41.

[2] Options exercisable represent “in-the-money” vested options based upon the weighted-average exercise price of vested options compared to the Company’s stock price on July 31, 2021.