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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 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 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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