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Employee Benefits - Pension (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Apr. 27, 2019	Jan. 26, 2019	Jan. 27, 2018	Jan. 26, 2019	Jan. 27, 2018
Net periodic pension costs
Service cost		$ 223	$ 328	$ 869	$ 986
Interest cost		1,116	1,147	3,348	3,441
Expected return on plan assets		(1,136)	(1,204)	(3,408)	(3,612)
Net amortization		639	780	1,917	2,340
Net periodic pension cost		842	$ 1,051	2,726	$ 3,155
Minimum
Net periodic pension costs
Anticipated additional contributions to the plan		9,000		9,000
Minimum | Forecast
Net periodic pension costs
Expected non-cash charge, net of tax	$ 33,000
Maximum
Net periodic pension costs
Anticipated additional contributions to the plan		$ 11,000		$ 11,000
Maximum | Forecast
Net periodic pension costs
Expected non-cash charge, net of tax	$ 38,000

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- Definition

Amount of expected non-cash charges due to plan termination.

+ References

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- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year.

+ References

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-Section 50
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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

+ References

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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

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