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Retirement and Welfare Plans - Hourly Plan, Assets (Details) - Defined benefit pension plan for factory hourly employees (funded) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Apr. 28, 2018 | Apr. 29, 2017 | Apr. 30, 2016
Pension assets |  |  |
Fair value of plan assets | $ 107,074 | $ 109,012 | $ 112,484
Transfers from Level 1 to Level 2 assets | 0 | 0 |
Transfers from Level 2 to Level 1 assets | 0 | 0 |
Employer contributions | 2,000 | 2,300 |
Expected contributions during fiscal 2019 | 7,000 |  |
Level 1 |  |  |
Pension assets |  |  |
Fair value of plan assets | 1,506 | 1,561 |
Level 2 |  |  |
Pension assets |  |  |
Fair value of plan assets | $ 96,230 | 97,860 |
Fixed rate investments |  |  |
Pension assets |  |  |
Strategic asset allocation (as a percent) | 85.00% |  |
Cash and equivalents | Level 1 |  |  |
Pension assets |  |  |
Fair value of plan assets | $ 57 | 44 |
Cash and equivalents | Level 2 |  |  |
Pension assets |  |  |
Fair value of plan assets | 3,272 | 3,730 |
Equity funds | Level 1 |  |  |
Pension assets |  |  |
Fair value of plan assets | 1,449 | 1,517 |
Equity funds | Level 2 |  |  |
Pension assets |  |  |
Fair value of plan assets | 119 | 181 |
Debt funds | Level 2 |  |  |
Pension assets |  |  |
Fair value of plan assets | 92,839 | 93,949 |
Common trust funds, measured using net asset value |  |  |
Pension assets |  |  |
Fair value of plan assets | $ 9,300 | $ 9,600 |

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