Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands					1 Months Ended	3 Months Ended			9 Months Ended	12 Months Ended
	Feb. 02, 2016	Dec. 21, 2015	Nov. 04, 2015	Dec. 16, 2014	Dec. 31, 2015	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2016	Sep. 30, 2015
Assets and liabilities measured at fair value on a recurring basis
Contingent consideration payments related to acquisitions of businesses									$ (1,679)
DTECH
Assets and liabilities measured at fair value on a recurring basis
Volatility earning metrics									22.00%	20.00%
Initial measurement recognized at acquisition				$ 99,400
Cash paid to seller					$ (5,000)
H4 Global
Assets and liabilities measured at fair value on a recurring basis
Contingent consideration paid based upon contracts entered period			5 years
Initial measurement recognized at acquisition			$ 1,900
TeraLogics
Assets and liabilities measured at fair value on a recurring basis
Volatility earning metrics									18.00%
Initial measurement recognized at acquisition		$ 9,000
GATR
Assets and liabilities measured at fair value on a recurring basis
Volatility earning metrics									18.00%
Contingent consideration paid based upon contracts entered period	12 months
Change in fair value of contingent consideration						$ 600			$ 700
Level 2
Debt instruments
Fair Value						208,200			208,200	$ 125,800
Carrying value						201,200			201,200	126,700
Level 3
Assets and liabilities measured at fair value on a recurring basis
Balance at the Beginning period						12,699	$ 10,018	$ 7,507	7,507
Initial measurement recognized at acquisition							2,500	6,702
Cash paid to seller								(5,000)
Adjustment to the provisional acquisition date valuation							(716)
Total remeasurement recognized in earnings						1,050	897	809
Balance at the ending period					10,018	13,749	12,699	10,018	13,749	7,507
Level 3 | DTECH
Assets and liabilities measured at fair value on a recurring basis
Balance at the Beginning period						4,400	3,316	7,507	7,507
Cash paid to seller								(5,000)
Total remeasurement recognized in earnings						300	1,084	809
Balance at the ending period					3,316	4,700	4,400	3,316	4,700	7,507
Level 3 | H4 Global
Assets and liabilities measured at fair value on a recurring basis
Balance at the Beginning period						799	1,602
Initial measurement recognized at acquisition								1,602
Adjustment to the provisional acquisition date valuation							(616)
Total remeasurement recognized in earnings						(50)	(187)
Balance at the ending period					1,602	749	799	1,602	749
Level 3 | GATR
Assets and liabilities measured at fair value on a recurring basis
Balance at the Beginning period						2,600
Initial measurement recognized at acquisition							2,500
Total remeasurement recognized in earnings						600	100
Balance at the ending period						3,200	2,600		3,200
Level 3 | Contract Extensions | TeraLogics
Assets and liabilities measured at fair value on a recurring basis
Balance at the Beginning period						2,000	2,000
Initial measurement recognized at acquisition								2,000
Adjustment to the provisional acquisition date valuation							(100)
Total remeasurement recognized in earnings						100	100
Balance at the ending period					2,000	2,100	2,000	2,000	2,100
Level 3 | Revenue Targets | TeraLogics
Assets and liabilities measured at fair value on a recurring basis
Balance at the Beginning period						2,900	3,100
Initial measurement recognized at acquisition								3,100
Total remeasurement recognized in earnings						100	(200)
Balance at the ending period					$ 3,100	3,000	$ 2,900	$ 3,100	3,000
Assets and liabilities measured at fair value
Assets
Cash equivalents						63,161			63,161	68,194
Marketable securities						13,331			13,331	30,533
Current derivative assets						14,570			14,570	11,543
Noncurrent derivative assets						728			728	13,909
Marketable securities in rabbi trust						257			257	992
Total assets measured at fair value						92,047			92,047	125,171
Liabilities
Current derivative liabilities						13,445			13,445	9,370
Noncurrent derivative liabilities						817			817	13,909
Total liabilities measured at fair value						28,011			28,011	30,786
Assets and liabilities measured at fair value | DTECH
Liabilities
Noncurrent contingent consideration to seller						4,700			4,700	7,507
Assets and liabilities measured at fair value | H4 Global
Liabilities
Noncurrent contingent consideration to seller						749			749
Assets and liabilities measured at fair value | GATR
Liabilities
Noncurrent contingent consideration to seller						3,200			3,200
Assets and liabilities measured at fair value | Contract Extensions | TeraLogics
Liabilities
Noncurrent contingent consideration to seller						2,100			2,100
Assets and liabilities measured at fair value | Revenue Targets | TeraLogics
Liabilities
Noncurrent contingent consideration to seller						3,000			3,000
Assets and liabilities measured at fair value | Level 1
Assets
Cash equivalents						58,882			58,882	68,194
Marketable securities in rabbi trust						257			257	992
Total assets measured at fair value						59,139			59,139	69,186
Assets and liabilities measured at fair value | Level 2
Assets
Cash equivalents						4,279			4,279
Marketable securities						13,331			13,331	30,533
Current derivative assets						14,570			14,570	11,543
Noncurrent derivative assets						728			728	13,909
Total assets measured at fair value						32,908			32,908	55,985
Liabilities
Current derivative liabilities						13,445			13,445	9,370
Noncurrent derivative liabilities						817			817	13,909
Total liabilities measured at fair value						14,262			14,262	23,279
Assets and liabilities measured at fair value | Level 3
Liabilities
Total liabilities measured at fair value						13,749			13,749	7,507
Assets and liabilities measured at fair value | Level 3 | DTECH
Liabilities
Noncurrent contingent consideration to seller						4,700			4,700	$ 7,507
Assets and liabilities measured at fair value | Level 3 | H4 Global
Liabilities
Noncurrent contingent consideration to seller						749			749
Assets and liabilities measured at fair value | Level 3 | GATR
Liabilities
Noncurrent contingent consideration to seller						3,200			3,200
Assets and liabilities measured at fair value | Level 3 | Contract Extensions | TeraLogics
Liabilities
Noncurrent contingent consideration to seller						2,100			2,100
Assets and liabilities measured at fair value | Level 3 | Revenue Targets | TeraLogics
Liabilities
Noncurrent contingent consideration to seller						$ 3,000			$ 3,000