Marketable Securities (Tables)

12 Months Ended

Sep. 28, 2018

Investments, Debt and Equity Securities [Abstract]

Available-for-sale Securities [Table Text Block]

The Company's portfolio of available-for-sale marketable securities consists of the following (in millions):



	Current				Noncurrent
Available for sale:	September 28, 2018		September 29, 2017		September 28, 2018		September 29, 2017
U.S. Treasury and government	$	65.0	$	—	$	—	$	—
Corporate bonds and notes	204.1		—		12.0		—
Municipal bonds	2.0		—		0.8		—
Other government	23.0		—		10.0		—
Total	$	294.1	$	—	$	22.8	$	—

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

The Company recorded unrealized gains and losses on sales of available-for-sale marketable securities as follows (in millions):



September 28, 2018	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
U.S. Treasury and government	$	65.0	$	—	$	—		$	65.0
Corporate bonds and notes	216.1		—		(0.1		)	216.0
Municipal bonds	2.8		—		—			2.8
Other government	33.1		—		—			33.1
Total	$	317.0	$	—	$	(0.1	)	$	316.9

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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