Accrued Liabilities (Detail) - USD ($) $ in Millions	Sep. 27, 2015	Sep. 28, 2014
Accounts Payable and Accrued Liabilities, Current [Abstract]
Payroll, bonus, and employee benefits	$ 33.3	$ 34.3
Deferred revenue	9.7	11.4
Outside services	9.2	9.6
Warranties	6.4	6.9
Commissions	3.8	4.0
Licenses	6.0	1.1
Accrued Rent, Current	2.6	0.7
Restructuring and severance	2.5	8.4
Customer Deposits, Current	2.2	1.1
Property and sales tax	1.3	1.1
Income taxes	1.4	1.0
Other	8.4	6.1
Total	$ 86.8	$ 85.7