Accrued Liabilities (Detail) - USD ($) $ in Millions	Oct. 02, 2016	Sep. 27, 2015
Accounts Payable and Accrued Liabilities, Current [Abstract]
Payroll, bonus, and employee benefits	$ 53.8	$ 33.3
Deferred revenue	15.1	9.7
Outside services	12.8	9.2
Warranties	7.5	6.4
Commissions	4.3	3.8
Licenses	26.0	6.0
Accrued Rent, Current	2.5	2.6
Restructuring and severance	4.6	2.5
Customer Deposits, Current	1.1	2.2
Property and sales tax	2.4	1.3
Interest	31.2	0.0
Other	4.8	9.8
Total	$ 166.1	$ 86.8