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STOCK BASED COMPENSATION (Tables)
 12 Months Ended
Jan. 02, 2021
Share-based Payment Arrangement [Abstract]  
Summary assumptions utilized to calculate fair value of stock options granted
The following assumptions were utilized to calculate the fair value of stock options granted during the periods indicated below:

20192018
Expected option term6 years6 years
Expected stock price volatility
27% - 35%
35%
Risk-free interest rate
1.64% - 2.53%
2.99
Expected dividend yield–%–%
Weighted average fair value at date of grant$7.67$7.22
Summary of stock options
A summary of the stock options is as follows for the periods indicated (in thousands, except per share data):

Number of
Options
Weighted
Average Exercise
Price
Weighted
Average
Remaining
Contractual
Term (Years)
Aggregate
Intrinsic
Value
Balance, December 30, 20172,884 $5.22 6.10
Granted761 18.00 
Exercised(560)0.47 
Forfeited/cancelled(172)47.91 
Expired(24)53.55 
Balance, December 29, 20182,889 $6.56 6.48
Granted601 23.59 
Exercised(1,730)2.06 
Forfeited/cancelled(142)20.88 
Balance, December 28, 20191,618 $16.44 8.12
Exercised(247)12.23 
Forfeited/cancelled(117)21.56 
Balance, January 2, 20211,254 $16.79 7.22$64,781 
Exercisable, January 2, 2021715 $14.07 6.66$38,917 
Summary of non-vested stock options
The following is a summary of our non-vested stock options for the periods indicated (in thousands, except per share data):

 
Shares Under
Outstanding
Options
Weighted
Average Grant
Date Fair Value
Non-vested options at December 28, 20191,044 $7.47 
Granted— — 
Forfeited(117)7.81
Vested(388)7.41
Non-vested options at January 2, 2021539 $7.44 
Summary of PBRSs, RSUs, RSAs, and DSUs
Stock-based activity, excluding options, for the year ended January 2, 2020 is summarized below (in thousands, except per share data):
Performance-Based Restricted Stock AwardsRestricted Stock Units, Restricted Stock Awards, and Deferred Stock Units
Number of PBRSs
Weighted Average Grant Date Fair Value
Number of RSUs, RSAs, and DSUs
Weighted Average Grant Date Fair Value
Nonvested, December 28, 2019— $— 319 $23.61 
Granted166 32.84 404 33.88 
Vested/released— — (136)23.62 
Forfeited/expired(20)32.84 (114)29.34 
Nonvested, January 2, 2021146 $32.84 473 $30.99 
The following table summarizes additional information about PBRSs, RSUs, RSAs, and DSUs (in thousands, except per share data):
Fiscal Year Ended (1)
January 2,
2021		December 28,
2019		December 29,
2018
Weighted average grant date fair value per share of awards granted$33.58 $23.72 $17.00 
Total grant date fair value of awards vested(2)
$3,215 $168 —
Intrinsic value of awards vested(2)
$5,271 $345 —
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(1)Excludes performance-based RSUs activity. See below for further discussion.
(2)Excludes approximately 10,500 and 13,000 DSUs that vested but were not released in 2020 and 2019, respectively.