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STOCK BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 28, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
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:

201920182017
Expected option term6 years6 years
5 - 6 years
Expected stock price volatility
27% - 35%
35%  30%  
Risk-free interest rate
1.64% - 2.53%
2.99%  
2.05% - 2.18%
Expected dividend yield–%  –%  –%  
Weighted average fair value at date of grant$7.67  $7.22  $10.84  
Summary of the performance based RSUs, RSUs, and DSUs A summary of the performance-based RSUs, RSUs, and DSUs is as follows for the periods indicated (in thousands, except per share data):
Performance-Based Restricted Stock Units
Restricted Stock Units
Deferred Stock Units
Number of RSUs
Weighted Average Grant Date Fair Value
Number of RSUs
Weighted Average Grant Date Fair Value
Number of DSUs
Weighted Average Grant Date Fair Value
Balance, December 29, 20181,411  $31.74  7  $17  13  $17  
Granted—  —  338  23.69  10  24.80  
Vested(1,284) 31.74  (10) 17.51  —  —  
Forfeited/cancelled(127) 31.74  (39) 22.84  —  —  
Balance, December 28, 2019—  $—  296  $23.85  23  $20.39  
Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
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 31, 20163,498  $4.10  5.99
Granted77  53.51  
Exercised(156) 0.65  
Forfeited/cancelled(529) 5.71  
Expired(6) 46.63  
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  
Expired—  —  
Balance, December 28, 20191,618  $16.44  8.12$29,985  
Exercisable, December 28, 2019574  $8.48  6.50$15,210  
Non-vested stock options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of 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 29, 20181,155  $14.25  
Granted601  7.67
Forfeited(142) 7.28
Vested(570) 21.47
Non-vested options at December 28, 20191,044  $7.47