Leases - Reconciliation of Termination Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Oct. 01, 2017
Reconciliation of the beginning and ending balances of liabilities related to contract termination costs
Balance at the beginning of the period	$ 1,694	$ 3,104
Adjustments	(774)	(1,410)
Balance at the end of the period	920	1,694
GSG
Reconciliation of the beginning and ending balances of liabilities related to contract termination costs
Balance at the beginning of the period	259	674
Adjustments	(259)	(415)
Balance at the end of the period	0	259
CIG
Reconciliation of the beginning and ending balances of liabilities related to contract termination costs
Balance at the beginning of the period	1,432	2,391
Adjustments	(512)	(959)
Balance at the end of the period	920	1,432
RCM
Reconciliation of the beginning and ending balances of liabilities related to contract termination costs
Balance at the beginning of the period	3	39
Adjustments	(3)	(36)
Balance at the end of the period	$ 0	$ 3