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Commitments and Contingencies (Details) $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
May 31, 2016 USD ($) | Jan. 31, 2016 USD ($) item | May 31, 2017 USD ($) | May 31, 2016 USD ($)
Accrual for warranty returns |  |  |  |
Beginning balance |  |  | $ 21,766 | $ 20,622
Additions to the accrual |  |  | 12,239 | 14,523
Reductions of the accrual - payments and credits issued |  |  | (13,376) | (16,164)
Ending balance | $ 18,981 |  | $ 20,629 | $ 18,981
Minimum |  |  |  |
Accrual for warranty returns |  |  |  |
Product warranty period |  |  | 2 years |
Maximum |  |  |  |
Accrual for warranty returns |  |  |  |
Product warranty period |  |  | 5 years |
Thermometer Patent Litigation | Litigation |  |  |  |
Commitments and contingencies |  |  |  |
Number of models | item |  | 2 |  |
Charge including legal fees and other related expenses |  | $ 17,800 |  |
Amount of additional pre-judgment compensation | $ 1,500 |  |  |

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