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Employee Pension and Other Benefit Plans - Additional Information (Details) £ in Millions	12 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2018 GBP (£)	Jul. 01, 2017 USD ($)	Jul. 01, 2017 GBP (£)	Jul. 02, 2016 USD ($)
Employee 401(k) Plans
Maximum contribution by an employee, as percentage of annual compensation	50.00%	50.00%
Maximum amount of contribution by an employee in a calendar year	$ 18,500
Employer match of employee's contributions of the first 3% of eligible compensation (as a percent)	100.00%	100.00%
Percentage of eligible compensation, matched 100% by employer	3.00%	3.00%
Employer match of employee's contributions of the next 2% of eligible compensation (as a percent)	50.00%	50.00%
Percentage of eligible compensation, matched 50% by employer	2.00%	2.00%
Company's matching contribution to the plan	$ 4,200,000		$ 4,100,000		$ 4,700,000
Employee Defined Benefit Plans
Required contributions expected in next fiscal year	$ 0
Minimum maturity period for investment in index-linked Gilts	5 years	5 years
Pension Benefit Plans
Employee Defined Benefit Plans
Benefit obligation	$ 136,700,000		133,400,000		$ 134,600,000
Future amortization of losses	1,900,000
Employer contributions	6,100,000		4,000,000
Other Post Retirement Benefit Plans
Employee Defined Benefit Plans
Benefit obligation	400,000		1,100,000
United Kingdom | Pension Benefit Plans
Employee Defined Benefit Plans
Employer contributions	$ 1,000,000	£ 0.8	$ 600,000	£ 0.5

X

- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

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X

- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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- Definition

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.

+ References

No definition available.

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X

- Definition

Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position.

+ References

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- Definition

Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year.

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- Definition

Amount of cost for defined contribution plan.

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- Definition

Maximum amount the employee may contribute to a defined contribution plan.

+ References

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

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- Definition

Represents the minimum maturity period for fixed income plan assets invested in indexed-linked gilts.

+ References

No definition available.

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X

- Definition

Represents the first level of employee's contributions expressed as a percentage of compensation which is matched by the employer.

+ References

No definition available.

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- Definition

Represents the second level of employee' contributions expressed as a percentage of compensation which is matched by the employer.

+ References

No definition available.

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- Definition

Represents the employer matching contribution of the first level of employee's contributions.

+ References

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- Definition

Represents the employer matching contribution of the second level of employee's contributions.

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