FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	10 Months Ended	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Dec. 16, 2014	Dec. 14, 2014	Sep. 30, 2014
Assets and liabilities measured at fair value on a recurring basis
Change in fair value of contingent consideration		$ 3,607
Debt instruments
Carrying value	$ 126,705	126,705			$ 102,390
Level 2 assets erroneously reported as Level 1 assets | Marketable securities
Assets and liabilities measured at fair value on a recurring basis
Quantifying immaterial misstatement amount		25,600
Level 2 assets erroneously reported as Level 1 assets | Cash Equivalents [Member]
Assets and liabilities measured at fair value on a recurring basis
Quantifying immaterial misstatement amount		10,200
DTECH LABS, Inc.
Assets and liabilities measured at fair value on a recurring basis
Estimated fair value of the liability for contingent consideration	7,500	7,500	$ 3,900
Level 2
Debt instruments
Fair Value	125,800	125,800			99,900
Carrying value	126,700	$ 126,700			102,400
Level 3 | DTECH LABS, Inc.
Assets and liabilities measured at fair value on a recurring basis
Volatility for underlying earnings metrics used in determination of fair value of contingent consideration		22.00%
Estimated fair value of the liability for contingent consideration	7,507,000	$ 7,507,000		$ 3,900,000
Change in fair value of contingent consideration since the date of the acquisition	3,607,000
Assets and liabilities measured at fair value | Total
Assets
Cash equivalents	68,194	68,194			56,333
Marketable securities	30,533	30,533			25,557
Current derivative assets	11,543	11,543			7,389
Noncurrent derivative assets	13,909	13,909			5,920
Total assets measured at fair value	125,171	125,171			95,199
Liabilities
Current derivative liabilities	9,370	9,370			6,645
Noncurrent derivative liabilities	13,909	13,909			5,878
Total liabilities measured at fair value	30,786	30,786			12,523
Assets and liabilities measured at fair value | DTECH LABS, Inc. | Total
Liabilities
Current contingent consideration to seller	5,000	5,000
Noncurrent contingent consideration to seller	2,507	2,507
Assets and liabilities measured at fair value | Rabbi trust | Total
Assets
Marketable securities	992	992
Assets and liabilities measured at fair value | Level 1
Assets
Cash equivalents	68,194	68,194			46,183
Total assets measured at fair value	69,186	69,186			46,183
Assets and liabilities measured at fair value | Level 1 | Rabbi trust
Assets
Marketable securities	992	992
Assets and liabilities measured at fair value | Level 2
Assets
Cash equivalents					10,150
Marketable securities	30,533	30,533			25,557
Current derivative assets	11,543	11,543			7,389
Noncurrent derivative assets	13,909	13,909			5,920
Total assets measured at fair value	55,985	55,985			49,016
Liabilities
Current derivative liabilities	9,370	9,370			6,645
Noncurrent derivative liabilities	13,909	13,909			5,878
Total liabilities measured at fair value	23,279	23,279			$ 12,523
Assets and liabilities measured at fair value | Level 3
Liabilities
Total liabilities measured at fair value	7,507	7,507
Assets and liabilities measured at fair value | Level 3 | DTECH LABS, Inc.
Liabilities
Current contingent consideration to seller	5,000	5,000
Noncurrent contingent consideration to seller	$ 2,507	$ 2,507