Quarterly report pursuant to Section 13 or 15(d)

Line Of Credit (Narrative) (Details)

v3.20.1
Line Of Credit (Narrative) (Details)
3 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Jul. 15, 2019
USD ($)
item
Mar. 28, 2020
USD ($)
Dec. 28, 2019
USD ($)
Feb. 19, 2016
USD ($)
Line of Credit Facility [Line Items]          
Credit facility     $ 75,000,000    
Line of Credit [Member]          
Line of Credit Facility [Line Items]          
Increased (decreased) line of credit     9,234,000 $ 8,924,000  
Outstanding debt     $ 0 $ 0  
Maturity date     Apr. 27, 2021    
Amended And Restated Credit Agreement [Member]          
Line of Credit Facility [Line Items]          
Adjusted EBITDA covenant         $ 100,000,000
Third Amendment [Member] | Line of Credit [Member]          
Line of Credit Facility [Line Items]          
Increased (decreased) line of credit   $ 125,000,000      
Credit facility   $ 200,000,000      
Third Amendment [Member] | Maximum [Member] | Line of Credit [Member]          
Line of Credit Facility [Line Items]          
Number of increments | item   3      
Third Amendment [Member] | Minimum [Member] | Line of Credit [Member]          
Line of Credit Facility [Line Items]          
Capacity available   $ 25,000,000      
Third Amendment [Member] | Scenario, Forecast [Member]          
Line of Credit Facility [Line Items]          
Increased (decreased) line of credit $ 100,000,000