Stock-Based Compensation (Details 1) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 30, 2018	Dec. 31, 2019	Sep. 30, 2018
Stock-based compensation	$ 1.6	$ 1.6	$ 9.0	$ 7.4
RSAs and RSUs [Member]
Stock-based compensation		1.6	8.7	5.0
Modification of awards [Member]
Stock-based compensation				2.1
Payroll taxes on vesting of RSUs [Member]
Stock-based compensation			$ 0.3	$ 0.3