ACCOUNTS RECEIVABLE AND LONG TERM CONTRACTS (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 01, 2017	Jan. 31, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts			$ 2,400		$ 2,400		$ 1,200
Provision for doubtful accounts			$ 100	$ 3,400	$ 2,472	$ 4,619
Atwood Achiever
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract terms, proceeds from contract term adjustment, amount		$ 48,100
Contract terms, daily operating rate, receivable, amount	$ 595