Defined Contribution Plan (Narrative) (Details) $ in Millions		12 Months Ended
	Jan. 01, 2014	Sep. 30, 2019 USD ($) employee	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
Retirement Benefits [Abstract]
Percentage of company match	100.00%
Maximum percentage of eligible compensation	6.00%
Charged to expense | $		$ 7.8	$ 5.7	$ 5.5
Colleagues added to plan | employee		900