VALUATION AND QUALIFYING ACCOUNTS (Details) - Allowance for doubtful accounts - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]
BEGINNING BALANCE		$ 5,189	$ 5,357	$ 5,330
ADDITIONS CHARGED TO EXPENSE		1,616	2,859	2,504
OTHER	[1]	(1,940)	(3,027)	(2,477)
ENDING BALANCE		$ 4,865	$ 5,189	$ 5,357

[1] Uncollectible accounts written off, less recoveries and adjustments.