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Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Sep. 30, 2020
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans Profit Sharing Plan The Company participates in a multiple employer 401(k) profit sharing plan ("401(k) Plan"). All employees are eligible to participate, beginning with the first day of the month coincident with or immediately following the completion of one year of service and having reached the age of 21. In addition to employee contributions, the Company may contribute discretionary amounts for eligible participants. Contribution rates for participating employees must be equal. The Company contributed $6.7 million, $5.8 million and $5.7 million to the 401(k) Plan for the fiscal years ended September 30, 2020, 2019 and 2018, respectively.