Goodwill and Other Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Goodwill [Abstract]
Net balance - beginning of period			$ 168,491
Goodwill acquisitions during the period			144,969
Net balance - end of period	$ 313,460		313,460
Identifiable Intangible Assets [Abstract]
Net balance - beginning of period			85,294
Acquisitions during the period			148,476
Accumulated amortization during the period	(2,600)	$ 0	(2,646)	$ 0
Net balance - end of period	231,124		231,124
Expected Amortization Expense [Abstract]
2022 (excluding the six months ended March 31, 2022)	4,095		4,095
2023	8,190		8,190
2024	8,190		8,190
2025	8,190		8,190
2026	8,190		8,190
Thereafter	42,404		42,404
Finite-Lived Intangible Assets, Net	79,259		79,259
Trade Names [Member]
Identifiable Intangible Assets [Abstract]
Net balance - beginning of period			85,294
Acquisitions during the period			66,571
Net balance - end of period	151,865		151,865
Design Libraries [Member]
Identifiable Intangible Assets [Abstract]
Net balance - beginning of period			0
Acquisitions during the period			14,050
Accumulated amortization during the period			(454)
Net balance - end of period	13,596		13,596
Customer Relationships [Member]
Identifiable Intangible Assets [Abstract]
Net balance - beginning of period			0
Acquisitions during the period			67,855
Accumulated amortization during the period			(2,192)
Net balance - end of period	$ 65,663		$ 65,663