Significant Accounting Policies Concentrations (Details)	12 Months Ended
	Sep. 30, 2018	Sep. 24, 2017	Sep. 25, 2016
Customer/licensee one [Member] | Customer Concentration Risk [Member] | Revenue [Member]
Concentration Risk [Line Items]
Percentage of total	11.00%	18.00%	24.00%
Customer/licensee three [Member] | Customer Concentration Risk [Member] | Revenue [Member]
Concentration Risk [Line Items]
Percentage of total	11.00%
Customer/licensee two [Member] | Customer Concentration Risk [Member] | Revenue [Member]
Concentration Risk [Line Items]
Percentage of total	16.00%	17.00%	16.00%
Largest Customers [Member] | Credit Concentration Risk [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Percentage of total	37.00%	28.00%