Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands				3 Months Ended		9 Months Ended		12 Months Ended
	Feb. 02, 2016	Dec. 21, 2015	Nov. 04, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2016
Change in fair value of our Level 3 contingent consideration
Total remeasurement (gain) loss recognized in earnings				$ (2,500)	$ 1,100		$ 2,800
Changes in fair value of our Level 3 non-marketable debt and equity security assets
Balance at the Beginning period
Purchases						$ 2,200
Balance at the ending period				2,200		$ 2,200
DTECH
Assets and liabilities measured at fair value on a recurring basis
Volatility earning metrics						19.00%		18.00%
H4 Global
Assets and liabilities measured at fair value on a recurring basis
Period for contingent consideration contracts			5 years
Change in fair value of our Level 3 contingent consideration
Initial measurement recognized at acquisition			$ 1,900
TeraLogics
Assets and liabilities measured at fair value on a recurring basis
Volatility earning metrics						15.00%		17.00%
Change in fair value of our Level 3 contingent consideration
Initial measurement recognized at acquisition		$ 33,900
GATR
Assets and liabilities measured at fair value on a recurring basis
Volatility earning metrics						15.00%		17.00%
Period for contingent consideration contracts	12 months
Change in fair value of our Level 3 contingent consideration
Initial measurement recognized at acquisition	$ 220,500
Level 2
Debt instruments
Fair Value				204,900		$ 204,900		$ 210,000
Carrying value				200,700		200,700		201,000
Level 3
Change in fair value of our Level 3 contingent consideration
Balance at the Beginning period						11,267
Cash paid to seller						(2,500)
Total remeasurement (gain) loss recognized in earnings						(4,713)
Balance at the ending period				4,054		4,054		11,267
Level 3 | DTECH
Change in fair value of our Level 3 contingent consideration
Balance at the Beginning period						2,000
Total remeasurement (gain) loss recognized in earnings						(1,700)
Balance at the ending period				300		300		2,000
Level 3 | H4 Global
Change in fair value of our Level 3 contingent consideration
Balance at the Beginning period						567
Total remeasurement (gain) loss recognized in earnings						(13)
Balance at the ending period				554		554		567
Level 3 | GATR
Change in fair value of our Level 3 contingent consideration
Balance at the Beginning period						3,200
Total remeasurement (gain) loss recognized in earnings						(3,200)
Balance at the ending period								3,200
Level 3 | Contract extensions | TeraLogics
Change in fair value of our Level 3 contingent consideration
Balance at the Beginning period						1,400
Total remeasurement (gain) loss recognized in earnings						300
Balance at the ending period				1,700		1,700		1,400
Level 3 | Revenue Targets | TeraLogics
Change in fair value of our Level 3 contingent consideration
Balance at the Beginning period						4,100
Cash paid to seller						(2,500)
Total remeasurement (gain) loss recognized in earnings						(100)
Balance at the ending period				1,500		1,500		4,100
Assets and liabilities measured at fair value
Assets
Cash equivalents				79		79		57,455
Marketable securities				13,060		13,060		12,996
Current derivative assets				2,459		2,459		14,770
Noncurrent derivative assets				846		846		1,201
Marketable securities in rabbi trust				17		17		4
Non-marketable debt and equity securities				2,200		2,200
Total assets measured at fair value				18,661		18,661		86,426
Liabilities
Current derivative liabilities				3,096		3,096		13,752
Noncurrent derivative liabilities				846		846		1,334
Total liabilities measured at fair value				7,996		7,996		26,353
Assets and liabilities measured at fair value | DTECH
Liabilities
Noncurrent contingent consideration to seller				300		300		2,000
Assets and liabilities measured at fair value | H4 Global
Liabilities
Noncurrent contingent consideration to seller				554		554		567
Assets and liabilities measured at fair value | GATR
Liabilities
Noncurrent contingent consideration to seller								3,200
Assets and liabilities measured at fair value | Contract extensions | TeraLogics
Liabilities
Noncurrent contingent consideration to seller				1,700		1,700		1,400
Assets and liabilities measured at fair value | Revenue Targets | TeraLogics
Liabilities
Noncurrent contingent consideration to seller				1,500		1,500		4,100
Assets and liabilities measured at fair value | Level 1
Assets
Cash equivalents				79		79		57,455
Marketable securities in rabbi trust				17		17		4
Total assets measured at fair value				96		96		57,459
Assets and liabilities measured at fair value | Level 2
Assets
Marketable securities				13,060		13,060		12,996
Current derivative assets				2,459		2,459		14,770
Noncurrent derivative assets				846		846		1,201
Total assets measured at fair value				16,365		16,365		28,967
Liabilities
Current derivative liabilities				3,096		3,096		13,752
Noncurrent derivative liabilities				846		846		1,334
Total liabilities measured at fair value				3,942		3,942		15,086
Assets and liabilities measured at fair value | Level 3
Assets
Non-marketable debt and equity securities				2,200		2,200
Total assets measured at fair value				2,200		2,200
Liabilities
Total liabilities measured at fair value				4,054		4,054		11,267
Assets and liabilities measured at fair value | Level 3 | DTECH
Liabilities
Noncurrent contingent consideration to seller				300		300		2,000
Assets and liabilities measured at fair value | Level 3 | H4 Global
Liabilities
Noncurrent contingent consideration to seller				554		554		567
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 | Contract extensions | TeraLogics
Liabilities
Noncurrent contingent consideration to seller				1,700		1,700		1,400
Assets and liabilities measured at fair value | Level 3 | Revenue Targets | TeraLogics
Liabilities
Noncurrent contingent consideration to seller				$ 1,500		$ 1,500		$ 4,100