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Summary of Accounting Policies - Other Accrued Liabilities (Detail) - USD ($) $ in Millions	Dec. 29, 2018	Dec. 31, 2017	Dec. 30, 2017
Accounting Policies [Abstract]
Income taxes	$ 34.4		$ 41.6
Accrued warranty	17.1		17.2
Deferred subscription revenue	47.3		38.9
Accrued new tool return	43.7		23.9
Accrued property, payroll and other taxes	40.1		45.4
Accrued selling and promotion expense	28.7		28.6
Accrued legal charges	30.9		45.9
Other	131.4		146.6
Total other accrued liabilities	$ 373.6	$ 411.4	$ 388.1

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