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Commitments and Contingencies - Guarantees and Warranties (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 30, 2016 | Apr. 30, 2016 | May 02, 2015 | Jul. 30, 2016
Warranties: |  |  |  |
Identified warranty obligations accrued | $ 967 |  |  |
Remaining accrual | 30,496 | $ 30,496 |  | $ 29,916
Movement in Standard Product Warranty Accrual |  |  |  |
Beginning accrued warranty costs | 30,496 |  |  |
Warranties issued during the period | 3,066 |  |  |
Settlements made during the period | (4,613) |  |  |
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations | 967 |  |  |
Ending accrued warranty costs | $ 29,916 | 30,496 |  |
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 |  |  |  | 9,479
Performance guarantees | Surety bonds |  |  |  |
Guarantees: |  |  |  |
Performance guarantees outstanding |  |  |  | 38,808
Out-of-Home Product Application |  |  |  |
Warranties: |  |  |  |
Identified warranty obligations accrued | $ 247 | 9,174 | $ 1,168 |
Remaining accrual | 4,567 |  |  | $ 4,567
Movement in Standard Product Warranty Accrual |  |  |  |
Changes in accrued warranty costs for pre-existing warranties during the period, including expirations | 247 | $ 9,174 | $ 1,168 |
Ending accrued warranty costs | $ 4,567 |  |  |

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