GOODWILL AND INTANGIBLE ASSETS - NET - Summary of Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	12 Months Ended
	Sep. 30, 2024 USD ($)
Goodwill [Roll Forward]
Goodwill before impairment, beginning balance	$ 1,026,471
Accumulated impairment losses, beginning balance	(32,200)
Goodwill net, beginning balance	994,271
Goodwill disposal before impairment	(58,655)
Accumulated impairment losses	32,200
Goodwill, net disposal	(26,455)
Goodwill before impairment, ending balance	967,816
Accumulated impairment losses, ending balance	0
Goodwill net, ending balance	967,816
Residential
Goodwill [Roll Forward]
Goodwill before impairment, beginning balance	953,882
Accumulated impairment losses, beginning balance	0
Goodwill net, beginning balance	953,882
Goodwill disposal before impairment	0
Accumulated impairment losses	0
Goodwill, net disposal	0
Goodwill before impairment, ending balance	953,882
Accumulated impairment losses, ending balance	0
Goodwill net, ending balance	953,882
Commercial
Goodwill [Roll Forward]
Goodwill before impairment, beginning balance	72,589
Accumulated impairment losses, beginning balance	(32,200)
Goodwill net, beginning balance	40,389
Goodwill disposal before impairment	(58,655)
Accumulated impairment losses	32,200
Goodwill, net disposal	(26,455)
Goodwill before impairment, ending balance	13,934
Accumulated impairment losses, ending balance	0
Goodwill net, ending balance	$ 13,934