FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands						12 Months Ended
	Feb. 02, 2016	Dec. 21, 2015	Nov. 04, 2015	Oct. 01, 2015	Dec. 16, 2014	Sep. 30, 2016	Sep. 30, 2015
Debt instruments
Carrying value						$ 201,012	$ 126,705
TeraLogics
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						17.00%
Initial measurement recognized at acquisition		$ 33,900
GATR
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						17.00%
Initial measurement recognized at acquisition	$ 220,500
DTECH
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						18.00%	22.00%
Initial measurement recognized at acquisition					$ 99,400
H4 Global
Assets and liabilities measured at fair value on a recurring basis
Term of contingent consideration				5 years
Initial measurement recognized at acquisition			$ 1,900
H4 Global | Maximum
Assets and liabilities measured at fair value on a recurring basis
Cash paid to seller			$ (4,100)
Level 2
Debt instruments
Fair Value						$ 210,000	$ 125,800
Carrying value						201,000	126,700
Level 3
Assets and liabilities measured at fair value on a recurring basis
Balance at the Beginning period				$ 7,507		7,507
Initial measurement recognized at acquisition						9,202	3,900
Cash paid to seller						(6,000)
Adjustment to the provisional acquisition date valuation						(716)
Total remeasurement recognized in earnings						1,274	3,607
Balance at the ending period						11,267	7,507
Level 3 | GATR
Assets and liabilities measured at fair value on a recurring basis
Initial measurement recognized at acquisition						2,500
Total remeasurement recognized in earnings						700
Balance at the ending period						3,200
Level 3 | DTECH
Assets and liabilities measured at fair value on a recurring basis
Balance at the Beginning period				$ 7,507		7,507
Initial measurement recognized at acquisition							3,900
Cash paid to seller						(5,000)
Total remeasurement recognized in earnings						(507)	3,607
Balance at the ending period						2,000	7,507
Level 3 | H4 Global
Assets and liabilities measured at fair value on a recurring basis
Initial measurement recognized at acquisition						1,602
Adjustment to the provisional acquisition date valuation						(616)
Total remeasurement recognized in earnings						(419)
Balance at the ending period						567
Assets and liabilities measured at fair value | Total
Assets
Cash equivalents						57,455	68,194
Marketable securities						12,996	30,533
Current derivative assets						14,770	11,543
Noncurrent derivative assets						1,201	13,909
Total assets measured at fair value						86,426	125,171
Liabilities
Current derivative liabilities						13,752	9,370
Noncurrent derivative liabilities						1,334	13,909
Total liabilities measured at fair value						26,353	30,786
Assets and liabilities measured at fair value | GATR | Total
Liabilities
Noncurrent contingent consideration to seller						3,200
Assets and liabilities measured at fair value | DTECH | Total
Liabilities
Noncurrent contingent consideration to seller						2,000	7,507
Assets and liabilities measured at fair value | H4 Global | Total
Liabilities
Noncurrent contingent consideration to seller						567
Assets and liabilities measured at fair value | Rabbi trust | Total
Assets
Marketable securities in rabbi trust						4	992
Assets and liabilities measured at fair value | Level 1
Assets
Cash equivalents						57,455	68,194
Total assets measured at fair value						57,459	69,186
Assets and liabilities measured at fair value | Level 1 | Rabbi trust
Assets
Marketable securities in rabbi trust						4	992
Assets and liabilities measured at fair value | Level 2
Assets
Marketable securities						12,996	30,533
Current derivative assets						14,770	11,543
Noncurrent derivative assets						1,201	13,909
Total assets measured at fair value						28,967	55,985
Liabilities
Current derivative liabilities						13,752	9,370
Noncurrent derivative liabilities						1,334	13,909
Total liabilities measured at fair value						15,086	23,279
Assets and liabilities measured at fair value | Level 3
Liabilities
Total liabilities measured at fair value						11,267	7,507
Assets and liabilities measured at fair value | Level 3 | GATR
Liabilities
Noncurrent contingent consideration to seller						3,200
Assets and liabilities measured at fair value | Level 3 | DTECH
Liabilities
Noncurrent contingent consideration to seller						2,000	$ 7,507
Assets and liabilities measured at fair value | Level 3 | H4 Global
Liabilities
Noncurrent contingent consideration to seller						567
Contract extensions | Level 3 | TeraLogics
Assets and liabilities measured at fair value on a recurring basis
Initial measurement recognized at acquisition						2,000
Cash paid to seller						(1,000)
Adjustment to the provisional acquisition date valuation						(100)
Total remeasurement recognized in earnings						500
Balance at the ending period						1,400
Contract extensions | Assets and liabilities measured at fair value | TeraLogics | Total
Liabilities
Noncurrent contingent consideration to seller						1,400
Contract extensions | Assets and liabilities measured at fair value | Level 3 | TeraLogics
Liabilities
Noncurrent contingent consideration to seller						1,400
Revenue Targets | Level 3 | TeraLogics
Assets and liabilities measured at fair value on a recurring basis
Initial measurement recognized at acquisition						3,100
Total remeasurement recognized in earnings						1,000
Balance at the ending period						4,100
Revenue Targets | Assets and liabilities measured at fair value | TeraLogics | Total
Liabilities
Noncurrent contingent consideration to seller						4,100
Revenue Targets | Assets and liabilities measured at fair value | Level 3 | TeraLogics
Liabilities
Noncurrent contingent consideration to seller						$ 4,100