REAL ESTATE AND OTHER TRANSACTIONS - Additional Information (Detail) $ in Thousands					3 Months Ended					6 Months Ended				12 Months Ended
	Jun. 10, 2025 USD ($) Bed	Apr. 01, 2025 USD ($) Facility	Mar. 07, 2025 USD ($) Bed	Jun. 10, 2024 Bed	Sep. 30, 2025 USD ($)	Jun. 30, 2025 USD ($) Bed Facility	Mar. 31, 2025 USD ($)	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 06, 2025 USD ($)	Jun. 30, 2025 USD ($) Facility Bed	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Mar. 07, 2025 Facility	Mar. 05, 2025 Bed
Facility Activations Developments And Closures [Line Items]
Operating expenses						$ 398,342			$ 375,735			$ 773,079	$ 753,838
Company Owned Bed | Bed				2,400												2,400
Right of use liability and asset							$ 116,900
Non-cash asset impairment charge								$ 3,100
South Texas Family Residential Center / ICE
Facility Activations Developments And Closures [Line Items]
Agreement notice period for termination				60 days
Lease Liabilities and Adjustments													57,000
Idled Correctional Facilities
Facility Activations Developments And Closures [Line Items]
Number of facility | Facility												7
Idle Facilities
Facility Activations Developments And Closures [Line Items]
Operating expenses						3,200			2,400			$ 6,500	5,400
Two Community Corrections Facilities And Two Vacant Parcel Of Land [Member]
Facility Activations Developments And Closures [Line Items]
Gain on sale of properties														$ 3,300
Net proceeds from sale of properties														$ 13,300
Community
Facility Activations Developments And Closures [Line Items]
Sale of facility					$ 3,700
Carrying value						1,100						1,100
Operating expenses						$ 23,528			24,134			$ 47,141	48,278
Community | Idle Facilities
Facility Activations Developments And Closures [Line Items]
Number of beds at the facility | Facility						60						60
Net carrying value						$ 1,100						$ 1,100
Safety
Facility Activations Developments And Closures [Line Items]
Sale of facility					$ 4,000
Carrying Value						$ 2,700						$ 2,700
Number of beds at the facility | Bed						67,000						67,000
Operating expenses						$ 372,653			$ 348,121			$ 720,636	$ 698,219
Safety | Idled Non-Core Facilities
Facility Activations Developments And Closures [Line Items]
Number of facility | Facility												1
Number of beds at the facility | Bed						240						240
Net carrying value						$ 2,700						$ 2,700
Safety | Idle Facilities
Facility Activations Developments And Closures [Line Items]
Number of facility | Facility												9
California City Immigration Processing Center | Immigration And Customs Enforcement [Member] | Letter Agreement [Member]
Facility Activations Developments And Closures [Line Items]
Number of beds at the facility | Facility		2,560
Initial award		$ 10,000
California City Immigration Processing Center | Immigration And Customs Enforcement [Member] | Letter Agreement [Member] | Maximum
Facility Activations Developments And Closures [Line Items]
Maximum funding										$ 31,200
Midwest Regional Reception Center | Immigration And Customs Enforcement [Member] | Letter Agreement [Member]
Facility Activations Developments And Closures [Line Items]
Number of beds at the facility			1,033												1,033
Initial award			$ 5,000
Midwest Regional Reception Center | Immigration And Customs Enforcement [Member] | Letter Agreement [Member] | Maximum
Facility Activations Developments And Closures [Line Items]
Maximum funding											$ 22,600
Farmville Detention Center
Facility Activations Developments And Closures [Line Items]
Gross purchase price	$ 67,000
Business acquisition, transaction costs	$ 1,500
Number of beds at the facility | Bed	736