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Pension and Other Postretirement Pension Plans (Narrative) (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Sep. 29, 2017
Defined Benefit Plan Disclosure [Line Items] |  |
Decrease of plan benefit obligation | $ 356.2 |
Decrease of plan assets | $ 229.0 |
Total Other Non-current Assets |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Restricted investments |  | $ 7.7
Employee loans receivable |  | 2.2
SG&A Expense |  |
Defined Benefit Plan Disclosure [Line Items] |  |
One-time, non-cash benefit |  | $ 9.9
U.S. Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Period of annual average returns used in return on plan assets simulation model (in years) |  | 20 years

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