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GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income	$ 18,959	$ 500,106
Other comprehensive income (loss), net of income taxes:
Unrealized appreciation (depreciation) on securities, net		(601)
Minimum pension liability adjustments, net	225	340
Other comprehensive income (loss)	225	(261)
Comprehensive income (loss)	19,184	499,845
Eliminations
CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income	(37,701)	(528,785)
Other comprehensive income (loss), net of income taxes:
Comprehensive income (loss)	(37,701)	(528,785)
Guarantor/Parent | Reportable Legal Entities
CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income	18,959	500,106
Other comprehensive income (loss), net of income taxes:
Minimum pension liability adjustments, net	78	102
Other comprehensive income (loss)	78	102
Comprehensive income (loss)	19,037	500,208
Issuer Subsidiary | Reportable Legal Entities
CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income	27,124	509,258
Other comprehensive income (loss), net of income taxes:
Unrealized appreciation (depreciation) on securities, net		(601)
Minimum pension liability adjustments, net	147	238
Other comprehensive income (loss)	147	(363)
Comprehensive income (loss)	27,271	508,895
Non-Guarantor Subsidiaries | Reportable Legal Entities
CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income	10,577	19,527
Other comprehensive income (loss), net of income taxes:
Comprehensive income (loss)	$ 10,577	$ 19,527

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