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Organization and Summary of Significant Accounting Policies (Allowance Reserve) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 29, 2017
Dec. 30, 2016
Reserve Rollforward [Roll Forward]    
Discounts and Allowances $ 5,574 $ 1,299
Current period 55,001 16,482
Prior periods (1,441) (358)
Payment and Credits Issued (49,641) (11,849)
Discounts and Allowances 9,493 5,574
Chargebacks and Prompt Payment [Member]    
Reserve Rollforward [Roll Forward]    
Discounts and Allowances 1,802 119
Current period 33,310 8,271
Prior periods (817) (39)
Payment and Credits Issued (32,367) (6,549)
Discounts and Allowances 1,928 1,802
Other Discounts [Member]    
Reserve Rollforward [Roll Forward]    
Discounts and Allowances 794 251
Current period 7,301 2,747
Prior periods 0 2
Payment and Credits Issued (6,300) (2,206)
Discounts and Allowances 1,795 794
Rebates [Member]    
Reserve Rollforward [Roll Forward]    
Discounts and Allowances 2,627 891
Current period 14,390 5,105
Prior periods (624) (313)
Payment and Credits Issued (10,623) (3,056)
Discounts and Allowances 5,770 2,627
Returns [Member]    
Reserve Rollforward [Roll Forward]    
Discounts and Allowances 351 38
Current period 0 359
Prior periods 0 (8)
Payment and Credits Issued (351) (38)
Discounts and Allowances $ 0 $ 351