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Commitments and Contingencies - Guarantees and Warranties (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 29, 2017 | Apr. 30, 2016 | May 02, 2015
Movement in Standard Product Warranty Accrual |  |  |
Beginning accrued warranty costs | $ 30,496 | $ 26,481 |
Warranties issued during the period | 10,930 | 10,528 |
Settlements made during the period | (16,790) | (18,377) |
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations | 3,263 | 11,864 |
Ending accrued warranty costs | $ 27,899 | 30,496 | $ 26,481
Minimum |  |  |
Warranties: |  |  |
Standard parts warranty period | 1 year |  |
Installation warranty period | 1 year |  |
Maximum |  |  |
Warranties: |  |  |
Standard parts warranty period | 5 years |  |
Installation warranty period | 10 years |  |
Performance guarantees | Letter of credit and bank guarantees agreements |  |  |
Guarantees: |  |  |
Performance guarantees outstanding | $ 10,466 |  |
Performance guarantees | Surety bonds |  |  |
Guarantees: |  |  |
Performance guarantees outstanding | 39,994 |  |
Out-of-Home Product Application [Member] |  |  |
Movement in Standard Product Warranty Accrual |  |  |
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations | 1,766 | $ 9,174 | $ 1,168
Ending accrued warranty costs | $ 3,079 |  |

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