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Share-Based Compensation (Tables)
 12 Months Ended
Jan. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of allocation of stock-based compensation
Pre-tax share-based compensation was included in the Statements of Income for fiscal years 2021, 2020 and 2019 as follows: 
Fiscal Year Ended
(in thousands)January 31, 2021January 26, 2020January 27, 2019
Net sales offset (Warrant)$— $— $21,501 
Cost of sales2,501 1,928 1,639 
Selling, general and administrative37,000 38,556 35,430 
Product development and engineering13,485 11,565 8,267 
Share-based compensation$52,986 $52,049 $66,837 
Summary of fair value assumptions
Fiscal Year Ended
(in thousands)January 31, 2021January 26, 2020January 27, 2019
Net sales offset (Warrant)$— $— $21,501 
Cost of sales2,501 1,928 1,639 
Selling, general and administrative37,000 38,556 35,430 
Product development and engineering13,485 11,565 8,267 
Share-based compensation$52,986 $52,049 $66,837 
Summary of the activity for stock option awards
The following table summarizes the activity for stock options for fiscal year 2021:
(in thousands, except per share data)Number
of
Shares		Weighted-
Average
Exercise
Price
(per share)
Aggregate
Intrinsic
Value (1)
Number of
Shares
Exercisable		Weighted-Average
Contractual
Term (years)
Balance at January 26, 2020624 $30.26 $13,895 428
Granted— — 
Exercised(284)29.96 8,642 
Forfeited(5)44.51 
Balance at January 31, 2021335 $30.28 $13,627 238
Exercisable at January 31, 2021238 $24.37 $11,095 1.8
Vested and expected to vest after January 31, 2021335 $30.28 $13,627 2.3
Summary of unvested stock option awards
The following table summarizes information regarding unvested stock option awards at January 31, 2021:
(in thousands, except per share data)Number
of
Shares		Weighted-Average
Exercise Price
(per share)		Weighted-Average
Grant Date
Fair Value
(per share)
Balance at January 26, 2020196  $41.14   $12.13 
Granted—  —   — 
Vested(95) 37.24   10.84 
Forfeited(5) 43.87   13.01 
Balance at January 31, 202196  $44.80   $13.35 
Summary of activity for market performance units
The following table summarizes the activity for the non-employee directors restricted stock units for the fiscal year ended January 31, 2021:
(in thousands, except per share data)Total
Units		Units Subject to Share SettlementUnits Subject to Cash SettlementWeighted-Average
Grant Date
Fair Value
(per share)
Balance at January 26, 202026 12 14 $50.55 
Granted28 13 15 51.52 
Vested(26)(12)(14)50.55 
Forfeited— — — — 
Balance at January 31, 202128 13 15 $51.52 
Summary of the status of non-vested restricted stock unit awards and changes during the year
The following table is a summary of the status of non-vested restricted stock unit awards as of January 31, 2021, and changes during the year.
Restricted Stock Units, Stock Grants and Stock Units
(in thousands, except per share data)
SharesWeighted-Average
Grant Date Fair Value
(per share)
Nonvested at January 26, 20202,102  $43.43 
Granted909  56.28 
Vested(841) 39.81 
Forfeited(111) 46.97 
Nonvested at January 31, 20212,059 $50.39