Employee Benefit Plans (Details) - Multiple employer 401(k) profit sharing plan $ in Millions	9 Months Ended	12 Months Ended
	Jun. 30, 2018 USD ($)	Sep. 30, 2020 USD ($) year	Sep. 30, 2019 USD ($)
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, requisite service period		1 year
Defined contribution plan, minimum age requirement | year		21
Contributions by the Company | $	$ 5.7	$ 6.7	$ 5.8