Revenue (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 25, 2018	Mar. 31, 2019	Mar. 25, 2018	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Digital Services Revenue	$ 4,744,000	$ 3,815,000	$ 9,421,000	$ 7,476,000
Other Revenues	9,950,000	6,465,000	19,242,000	13,660,000
Unearned revenue	25,325,000		25,325,000		$ 23,895,000
Deferred Revenue, Revenue Recognized	4,784,000		20,511,000
Revenues	122,704,000	$ 127,805,000	258,905,000	$ 271,590,000
Contract with Customer, Asset, Net, Current	3,461,000		3,461,000		0
Accounts Receivable, before Allowance for Credit Loss, Current	45,689,000		45,689,000		48,517,000
Accounts Receivable, Allowance for Credit Loss	$ 5,473,000		$ 5,473,000		$ 4,806,000