Recent Accounting Pronouncements (Schedule of Adoption of ASU 2016-02 Leases) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Sep. 26, 2019	Sep. 24, 2019
Non-current assets:
Operating lease assets	$ 50,898
Current Liabilities:
Operating lease liability	4,634
Non-current liabilities:
Operating lease liabilities, less current portion	$ 55,589
Previously Reported [Member]
Non-current assets:
Operating lease assets
Current Liabilities:
Operating lease liability
Non-current liabilities:
Accrued deferred rent			2,881
Deferred lease incentives			5,698
Operating lease liabilities, less current portion
Restatement Adjustment [Member] | Accounting Standards Update 2016-02 [Member]
Non-current assets:
Operating lease assets			51,165
Current Liabilities:
Operating lease liability			4,346
Non-current liabilities:
Accrued deferred rent			(2,881)
Deferred lease incentives			(5,698)
Operating lease liabilities, less current portion			$ 55,398
As Restated [Member] | Accounting Standards Update 2016-02 [Member]
Non-current assets:
Operating lease assets		$ 51,165
Current Liabilities:
Operating lease liability		4,346
Non-current liabilities:
Accrued deferred rent
Deferred lease incentives
Operating lease liabilities, less current portion		$ 55,398