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Employee 401(k) Profit Sharing Plans - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Compensation And Retirement Disclosure [Abstract]
Duration of profit sharing plan	90 days
Introductory period of profit sharing	April 1 or October 1
Employees eligibility age for participating in profit sharing plan	21 years
Total participants contributions in Profit sharing plan	50.00%	50.00%	25.00%
Maximum of each participants compensation	5.00%	5.00%	5.00%
Contribution under the Profit sharing plan	$ 2,300	$ 1,900	$ 765

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Duration of profit sharing plan.

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- Definition

Employees eligibility age for participating in profit sharing plan.

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- Definition

Introductory period of profit sharing plan.

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- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Percentage employer matches of the employee's percentage contribution matched.

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