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Commitments and Contingencies - Guarantees and Warranties (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 27, 2018 | Apr. 29, 2017 | Apr. 30, 2016 | May 02, 2015 | Jan. 27, 2018
Warranties: |  |  |  |  |
Identified warranty obligations accrued | $ 5,230 |  |  |  |
Remaining accrual | 27,899 | $ 27,899 |  |  | $ 29,200
Movement in Standard Product Warranty Accrual |  |  |  |  |
Beginning accrued warranty costs | 27,899 |  |  |  |
Warranties issued during the period | 9,652 |  |  |  |
Settlements made during the period | (13,581) |  |  |  |
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations | 5,230 |  |  |  |
Ending accrued warranty costs | $ 29,200 | 27,899 |  |  |
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 |  |  |  |  | 13,396
Performance guarantees | Surety bonds |  |  |  |  |
Guarantees: |  |  |  |  |
Performance guarantees outstanding |  |  |  |  | 8,330
Out-of-Home Product Application |  |  |  |  |
Warranties: |  |  |  |  |
Identified warranty obligations accrued | $ 4,034 | 1,766 | $ 9,174 | $ 1,168 |
Remaining accrual | 3,066 |  |  |  | $ 3,066
Movement in Standard Product Warranty Accrual |  |  |  |  |
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations | 4,034 | $ 1,766 | $ 9,174 | $ 1,168 |
Ending accrued warranty costs | $ 3,066 |  |  |  |

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