Organization and Summary of Significant Accounting Policies - Additional Information (Detail) $ / shares in Units, $ in Thousands			3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Jun. 01, 2021 USD ($) $ / shares shares	Jan. 26, 2021 USD ($) $ / shares shares	Sep. 30, 2023 USD ($) $ / shares	Jun. 30, 2023 USD ($) $ / shares shares	Mar. 31, 2023 USD ($) $ / shares	Dec. 31, 2022 USD ($) $ / shares	Sep. 30, 2022 USD ($) $ / shares	Jun. 30, 2022 USD ($) $ / shares	Mar. 31, 2022 USD ($) $ / shares	Dec. 31, 2021 USD ($) $ / shares	Mar. 31, 2023 USD ($) $ / shares	Mar. 31, 2022 USD ($) $ / shares	Jun. 30, 2023 USD ($) $ / shares	Jun. 30, 2022 USD ($) $ / shares	Sep. 30, 2023 USD ($) Customer Reportingunit $ / shares shares	Sep. 30, 2022 USD ($) Customer Reportingunit $ / shares shares	Sep. 30, 2021 USD ($) Reportingunit	Sep. 30, 2020 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]
Total amount of incentives															$ 132,600	$ 105,800	$ 92,500
Advertising Expense															62,200	52,500	37,800
Research and development expenses															9,200	9,500	7,400
Gain (loss) on disposal of fixed assets															$ (200)	(500)	(1,000)
Lease term description															Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Leases may be classified as either operating leases or finance leases. We have made an accounting policy election to not include leases with an initial term of 12 months or less on the balance sheet.
Accumulated deficit			$ (64,377)	$ (103,608)	$ (138,248)	$ (156,473)	$ (126,738)	$ (125,340)	$ (150,476)	$ (181,096)	$ (138,248)	$ (150,476)	$ (103,608)	$ (125,340)	$ (64,377)	(126,738)
Net Income (Loss)			39,231	$ 34,640	$ 18,225	$ (29,735)	(1,398)	$ 25,136	$ 30,620	$ 12,800	$ (11,510)	$ 43,420	$ 23,130	$ 68,556	62,361	67,158	88,865
Lease asset			86,952				93,265								86,952	93,265
Lease liabilities			$ 96,374				$ 100,556								96,374	100,556
Impact of Restatement [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Accumulated deficit																		$ (1,400)
Net Income (Loss)															$ (5,600)	$ (8,100)	$ (4,300)
Qualitative Assessment [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Number of reporting units | Reportingunit																5	3
Quantitative Assessment [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Number of reporting units | Reportingunit															6	1	1
Minimum [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, useful lives			3 years												3 years
Maximum [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, useful lives			20 years												20 years
Accounts Receivable [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Customers accounted															one customer represented 17.2% of gross trade receivables.	two customers each represented more than 10% of gross trade receivables: Customer A was 10.6% and Customer B was 14.8%.
Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Customer [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage															17.20%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer A [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage																10.60%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | CustomerBMember
Organization And Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage																14.80%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Minimum [Member] | Two Customer [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage																10.00%
Accounts Receivable [Member] | Supplier Concentration Risk [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Number of Customer | Customer															1	2
Cost of Goods and Service Benchmark [Member] | Supplier Concentration Risk [Member] | Raw Materials [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage															17.00%	16.00%	18.00%
Residential Segment [Member] | Sales Revenue Net [Member] | Customer Concentration Risk [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage															10.00%	10.00%	10.00%
Common Class A [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Number of shares repurchased | shares															4,152,000	4,117,000
Common stock, par value per share | $ / shares			$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001
Stock repurchased during period, value															$ 116,579	$ 81,483
Common Class B [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Common stock, par value per share | $ / shares			$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001	0.001	$ 0.001	$ 0.001	$ 0.001
Over-Allotment Option [Member] | Common Class A [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Overallotment stock shares sold by shareholders during the period | shares	2,250,000	3,000,000		2,100,000
Over-Allotment Option [Member] | Common Class A [Member] | Maximum [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Overallotment stock shares sold by shareholders during the period | shares				2,100,000
Secondary Offerings [Member] | Common Class A [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Stock shares sold by shareholders during the period | shares	17,250,000	23,000,000		16,100,000
Number of shares repurchased | shares				1,477,832											1,477,832
Common stock, par value per share | $ / shares	$ 0.001	$ 0.001		$ 0.001									0.001
Estimated offering expenses	$ 1,100	$ 1,200		$ 1,100
Sales price per share | $ / shares	$ 43.50	$ 40.00		$ 24.36									$ 24.36
Stock repurchased during period, value				$ 36,000											$ 36,000
Selling Stockholders, aggregate purchase price															$ 36,000