9. INDEBTEDNESS - Schedule of Principal Amount of Loan Maturities Due Over the Years (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2026 USD ($)
Debt Instrument [Line Items]
Total principal payments by fiscal year	$ 1,822,210
Unamortized deferred financing costs and discounts	(31,529)
Total debt book value as of December 31, 2025	1,790,681
FY 2026 (Remainder)
Debt Instrument [Line Items]
Total principal payments by fiscal year	1,301
FY 2027
Debt Instrument [Line Items]
Total principal payments by fiscal year	12,232
FY 2028
Debt Instrument [Line Items]
Total principal payments by fiscal year	2,181
FY 2029
Debt Instrument [Line Items]
Total principal payments by fiscal year	4,537
FY 2030
Debt Instrument [Line Items]
Total principal payments by fiscal year	651,836
FY 2031
Debt Instrument [Line Items]
Total principal payments by fiscal year	115
Thereafter
Debt Instrument [Line Items]
Total principal payments by fiscal year	1,150,008
2032 Convertible notes
Debt Instrument [Line Items]
Total principal payments by fiscal year	1,150,000
2032 Convertible notes \| FY 2026 (Remainder)
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
2032 Convertible notes \| FY 2027
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
2032 Convertible notes \| FY 2028
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
2032 Convertible notes \| FY 2029
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
2032 Convertible notes \| FY 2030
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
2032 Convertible notes \| FY 2031
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
2032 Convertible notes \| Thereafter
Debt Instrument [Line Items]
Total principal payments by fiscal year	1,150,000
2030 Convertible notes
Debt Instrument [Line Items]
Total principal payments by fiscal year	650,000
2030 Convertible notes \| FY 2026 (Remainder)
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
2030 Convertible notes \| FY 2027
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
2030 Convertible notes \| FY 2028
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
2030 Convertible notes \| FY 2029
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
2030 Convertible notes \| FY 2030
Debt Instrument [Line Items]
Total principal payments by fiscal year	650,000
2030 Convertible notes \| FY 2031
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
2030 Convertible notes \| Thereafter
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
Deferred consideration
Debt Instrument [Line Items]
Total principal payments by fiscal year	10,000
Deferred consideration \| FY 2026 (Remainder)
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
Deferred consideration \| FY 2027
Debt Instrument [Line Items]
Total principal payments by fiscal year	10,000
Deferred consideration \| FY 2028
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
Deferred consideration \| FY 2029
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
Deferred consideration \| FY 2030
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
Deferred consideration \| FY 2031
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
Deferred consideration \| Thereafter
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
Western Alliance Bank Credit Agreement
Debt Instrument [Line Items]
Total principal payments by fiscal year	5,690
Western Alliance Bank Credit Agreement \| FY 2026 (Remainder)
Debt Instrument [Line Items]
Total principal payments by fiscal year	437
Western Alliance Bank Credit Agreement \| FY 2027
Debt Instrument [Line Items]
Total principal payments by fiscal year	930
Western Alliance Bank Credit Agreement \| FY 2028
Debt Instrument [Line Items]
Total principal payments by fiscal year	996
Western Alliance Bank Credit Agreement \| FY 2029
Debt Instrument [Line Items]
Total principal payments by fiscal year	3,327
Western Alliance Bank Credit Agreement \| FY 2030
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
Western Alliance Bank Credit Agreement \| FY 2031
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
Western Alliance Bank Credit Agreement \| Thereafter
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
Auto & equipment loans and financing
Debt Instrument [Line Items]
Total principal payments by fiscal year	4,133
Auto & equipment loans and financing \| FY 2026 (Remainder)
Debt Instrument [Line Items]
Total principal payments by fiscal year	516
Auto & equipment loans and financing \| FY 2027
Debt Instrument [Line Items]
Total principal payments by fiscal year	1,061
Auto & equipment loans and financing \| FY 2028
Debt Instrument [Line Items]
Total principal payments by fiscal year	1,092
Auto & equipment loans and financing \| FY 2029
Debt Instrument [Line Items]
Total principal payments by fiscal year	1,110
Auto & equipment loans and financing \| FY 2030
Debt Instrument [Line Items]
Total principal payments by fiscal year	231
Auto & equipment loans and financing \| FY 2031
Debt Instrument [Line Items]
Total principal payments by fiscal year	115
Auto & equipment loans and financing \| Thereafter
Debt Instrument [Line Items]
Total principal payments by fiscal year	8
Corporate facility mortgage
Debt Instrument [Line Items]
Total principal payments by fiscal year	1,927
Corporate facility mortgage \| FY 2026 (Remainder)
Debt Instrument [Line Items]
Total principal payments by fiscal year	42
Corporate facility mortgage \| FY 2027
Debt Instrument [Line Items]
Total principal payments by fiscal year	87
Corporate facility mortgage \| FY 2028
Debt Instrument [Line Items]
Total principal payments by fiscal year	93
Corporate facility mortgage \| FY 2029
Debt Instrument [Line Items]
Total principal payments by fiscal year	100
Corporate facility mortgage \| FY 2030
Debt Instrument [Line Items]
Total principal payments by fiscal year	1,605
Corporate facility mortgage \| FY 2031
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
Corporate facility mortgage \| Thereafter
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
Marquee Funding Partners debt
Debt Instrument [Line Items]
Total principal payments by fiscal year	460
Marquee Funding Partners debt \| FY 2026 (Remainder)
Debt Instrument [Line Items]
Total principal payments by fiscal year	306
Marquee Funding Partners debt \| FY 2027
Debt Instrument [Line Items]
Total principal payments by fiscal year	154
Marquee Funding Partners debt \| FY 2028
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
Marquee Funding Partners debt \| FY 2029
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
Marquee Funding Partners debt \| FY 2030
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
Marquee Funding Partners debt \| FY 2031
Debt Instrument [Line Items]
Total principal payments by fiscal year	0
Marquee Funding Partners debt \| Thereafter
Debt Instrument [Line Items]
Total principal payments by fiscal year	$ 0