Stock-based compensation (Textuals) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Jun. 27, 2015	Jun. 28, 2014	Jun. 29, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 62.0	$ 45.9	$ 43.7
Common stock of shares reserved for stock option and stock incentive plans	9,700,000
Stock options granted but not yet vested and vested but not yet exercised	2,015,378	1,809,176
Employee Stock Purchase Plan, number of shares available for future award	300,000
Contractual life of stock option grants	10 years
Percentage vesting increment on each anniversary of the grant date	25.00%
Exercise price as a percentage of share fair market value at date of grant	100.00%
Granted	$ 11.68	$ 11.45	$ 11.33
Intrinsic values of share options outstanding	$ 18.5
Intrinsic values of share options exercisable	14.0
Total fair value of shares vested	4.0	$ 3.7	$ 3.4
Cash received from exercise of stock options	$ 2.6	4.7	2.1
Performance shares vesting range, minimum	0.00%
Performance shares vesting range, maximum	200.00%
Employee Stock Purchase Plan, share purchase price as a percentage of fair market value at end of offering period	95.00%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 3.6	4.7	4.0
Shares available for grant	2,000,000
Total unrecognized compensation cost related to non vested awards	$ 2.9
Weighted average period for expected recognition of compensation cost	2 years 1 month 6 days
Stock Based Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant	4,800,000
Restricted incentive shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 50.5	34.4	26.8
Total unrecognized compensation cost related to non vested awards	$ 45.2
Weighted average period for expected recognition of compensation cost	1 year 10 months 24 days
Granted, but not yet vested	1,900,000
Fair value of shares vested	$ 36.2	30.5	25.4
Performance shares granted	1,107,134
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 6.8	$ 5.8	$ 11.9
Shares available for grant	2,600,000
Vesting period	3 years
Performance shares granted	200,000	200,000	300,000
Director stock-based compensation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 1.1	$ 1.0	$ 1.0

For the entity's Employee Stock Purchase Plan, the number of shares available for future purchases.

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For the entity's Employee Stock Purchase Plan, the employee share purchase price as a percentage of the share fair market value at end of offering period.

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The maximum number of performance shares that can be vested, as a percentage of the number initially granted, based upon the level of achievement of the defined performance goals.

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The minimum number of performance shares that can be vested, as a percentage of the number initially granted, based upon the level of achievement of the defined performance goals.

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Share based compensation arrangement by share based payment award equity instruments other than options vested in period fair value.

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The option exercise price as a percentage of the stock price at grant date.

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The contractual life of employee stock options, from time of grant.

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Share based compensation arrangements by share based payment award nonvested stock options number of shares previously awarded not yet delivered.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Percentage of vesting of share-based compensation awards.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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