Restructuring and Related Charges (Details) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Dec. 29, 2018 USD ($)	Sep. 29, 2018 USD ($) employee	Dec. 30, 2017 USD ($) employee	Dec. 29, 2018 USD ($)	Dec. 30, 2017 USD ($)	Jul. 01, 2017 employee	Jun. 30, 2018 USD ($)
Summary of various restructuring plans
Balance at the beginning of the period		$ 7.5		$ 7.5
Charges (Benefits)	$ 0.3		$ 2.5	15.1	$ 4.0
Cash Settlements				(10.8)
Non-cash Settlements and Other Adjustments				0.0
Balance at the end of the period	11.8			11.8
Long-term restructuring accrual	0.1			0.1			$ 0.1
NSE, including AW Restructuring Plan
Summary of various restructuring plans
Balance at the beginning of the period		0.0		0.0
Charges (Benefits)	0.6	$ 15.1		15.1
Cash Settlements				(4.3)
Non-cash Settlements and Other Adjustments				(0.1)
Balance at the end of the period	10.7			10.7
Number of employees impacted (employee) | employee		240
Trilithic Restructuring Plan
Summary of various restructuring plans
Balance at the beginning of the period		$ 2.9		2.9
Charges (Benefits)	0.0			0.0
Cash Settlements				(2.9)
Non-cash Settlements and Other Adjustments				0.0
Balance at the end of the period	0.0			0.0
Number of employees impacted (employee) | employee			40
Focused NSE Restructuring Plan
Summary of various restructuring plans
Balance at the beginning of the period		1.9		1.9
Charges (Benefits)	(0.3)			0.1
Cash Settlements				(2.1)
Non-cash Settlements and Other Adjustments				0.1
Balance at the end of the period	0.0			0.0
Number of employees impacted (employee) | employee						360
NE Lease Restructuring Plan
Summary of various restructuring plans
Balance at the beginning of the period		1.2		1.2
Charges (Benefits)	0.0			0.0
Cash Settlements				(0.7)
Non-cash Settlements and Other Adjustments				0.0
Balance at the end of the period	0.5			0.5
Contractual obligations under the operating lease, net of sublease income, fair value	0.5			0.5
Other Plans - prior to fiscal 2016
Summary of various restructuring plans
Balance at the beginning of the period		$ 1.5		1.5
Charges (Benefits)	0.0			(0.1)
Cash Settlements				(0.8)
Non-cash Settlements and Other Adjustments				0.0
Balance at the end of the period	0.6			0.6
Other Plans - prior to fiscal 2017
Summary of various restructuring plans
Balance at the end of the period	$ 0.6			$ 0.6