Investments and Fair Value Measurements (Details 2) - Short-term investment - Trading securities. - USD ($) $ in Millions	Jun. 27, 2015	Jun. 28, 2014
Trading securities related to deferred compensation plan
Deferred compensation plan assets	$ 3.4	$ 3.9
Debt securities
Trading securities related to deferred compensation plan
Deferred compensation plan assets	0.6	0.4
Money market instruments and funds
Trading securities related to deferred compensation plan
Deferred compensation plan assets	0.7	0.7
Marketable equity investments
Trading securities related to deferred compensation plan
Deferred compensation plan assets	$ 2.1	$ 2.8