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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 9 Months Ended
Jun. 30, 2019
BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]  
Estimated fair value of financing facilities and notes
The carrying amount of cash and cash equivalents, restricted cash and cash equivalents, receivables, trade payables and certain promissory notes, including a convertible debenture and redemption note payable, approximates fair value. The estimated fair values of the Company's long-term debt were as follows (in thousands):
 
June 30, 2019
 
Carrying Value         
 
Fair Value         
Senior Secured Credit Facility - Revolving
$
114,000

 
$
107,588

Senior Secured Credit Facility - Term Loan A
$
274,370

 
$
267,324

Senior Secured Credit Facility - Term Loan B
$
806,627

 
$
766,775

2016 7 7/8% Senior Unsecured Notes
$
490,056

 
$
489,375

MGE Niagara Credit Facility - Term Loan
$
75,140

 
$
75,140

The estimated fair values of the Company's long-term debt were based on Level 2 inputs (quoted market prices or prices of similar instruments) on or about June 30, 2019.