SUMMARY OF QUARTERLY FINANCIAL DATA (UNAUDITED) - ADDITIONAL DISCLOSURES (Details) - USD ($)	3 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Consolidated quarterly financial data
Reversal of incentive compensation accruals based on revised payout estimates	$ 2,300,000	$ 450,000	$ 950,000	$ 1,800,000	$ 1,100,000	$ 3,300,000
RPG | TRS division
Consolidated quarterly financial data
Legal expenses					$ 1,400,000