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Employee 401(k) Profit Sharing Plans
 12 Months Ended
Sep. 30, 2020
Compensation And Retirement Disclosure [Abstract]  
Employee 401(k) Profit Sharing Plans

18.  EMPLOYEE 401(k) PROFIT SHARING PLANS:

Employees are eligible to participate in our 401(k) Profit Sharing Plan (the “Plan”) following their 90-day introductory period starting either April 1 or October 1, provided that they are 21 years of age.  Under the Plan, we matched 50% of participants’ contributions, up to a maximum of 5% of each participant’s compensation. We contributed, under the Plan, or pursuant to previous similar plans, approximately $1.9 million, $2.3 million, and $2.7 million for the fiscal years ended September 30, 2018, 2019 and 2020, respectively.