ACCOUNTS RECEIVABLE AND LONG TERM CONTRACTS (Details) - USD ($)		1 Months Ended		3 Months Ended		6 Months Ended
	Feb. 01, 2017	Mar. 31, 2017	Jan. 31, 2017	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts		$ 2,300,000		$ 2,300,000		$ 2,300,000		$ 1,200,000
Provision for doubtful accounts				$ 2,400,000	$ 800,000	$ 2,369,000	$ 1,141,000
Atwood Osprey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract terms, daily operating rate, receivable, amount		$ 185,000
Atwood Achiever
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract terms, daily operating rate, receivable, amount	$ 595,000
Contract terms, proceeds from contract term adjustment, amount			$ 48,100,000