Accrued Liabilities (Detail) - USD ($) $ in Millions	Oct. 01, 2017	Oct. 02, 2016
Accounts Payable and Accrued Liabilities, Current [Abstract]
Payroll, bonus and employee benefits	$ 32.7	$ 53.8
Interest	24.2	31.2
Deferred revenue	24.0	15.1
Restructuring and severance	16.8	4.6
Licenses	13.6	26.0
Outside services	11.9	12.8
Income, property and sales taxes	11.9	1.1
Warranties	5.6	7.5
Commissions	3.3	4.3
Leases and rent	1.4	2.5
Customer deposits	1.3	1.1
Other	6.7	6.1
Total	$ 153.4	$ 166.1