Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Oct. 02, 2018	Jan. 01, 2019
Accounting Standards Update 2016-02
Recent Accounting Pronouncements
Lease practical expedient, use of hindsight		true
Right-of-use assets		$ 1,000.0
Operating lease liabilities		1,000.0
Additional expense		4.0
Accounting Standards Update 2014-09
Recent Accounting Pronouncements
Increase to deferred revenue		4.8
Reduction of retained earnings		$ 3.6
Early adoption \| Accounting Standards Update 2018-15
Recent Accounting Pronouncements
Capitalized implementation costs	$ 0.6

Amount of implementation costs capitalized during the period.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Amount of the cumulative effect on retained earnings net of related income tax effect.

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Indicates (true false) whether practical expedient is elected to use hindsight in determining lease term and in assessing impairment of right-of-use asset.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of operating lease expense. Excludes sublease income.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of lessee's right to use underlying asset under operating lease.

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