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Basis of Presentation and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 01, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Revenue reserve rollforward | Revenue Reserve Revenue reserve rollforward (in thousands):
|  | 2017 |  | 2016 |  | 2015
Beginning balance |  | $ | 23,096 |  |  | $ | 19,446 |  |  | $ | 17,402 |
Amount charged to revenue |  | 61,031 |  |  | 55,739 |  |  | 45,676 |
Actual returns |  | (62,121 | ) |  | (52,089 | ) |  | (43,632 | )
Ending balance |  | $ | 22,006 |  |  | $ | 23,096 |  |  | $ | 19,446 |
Allowance for doubtful accounts |
(in thousands) |  | 2017 |  | 2016 |  | 2015
Beginning balance |  | $ | 6,214 |  |  | $ | 7,293 |  |  | $ | 7,867 |
Increase due to acquisition |  | 2,391 |  |  | 77 |  |  | 326 |
Charged to operating expenses |  | 4,411 |  |  | 1,337 |  |  | 1,472 |
Deductions(1) |  | (3,865 | ) |  | (2,493 | ) |  | (2,372 | )
Ending balance |  | $ | 9,151 |  |  | $ | 6,214 |  |  | $ | 7,293 |
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(1) | Deductions related to the allowance for doubtful accounts represent amounts written off against the allowance, less recoveries.
Finited-lived intangible assets schedule of weighted average useful lives |
| Weighted Average Useful Life (years)
Purchased technology | 5
Customer contracts and relationships | 9
Trademarks | 8
Acquired rights to use technology | 9
Localization | 1
Other intangibles | 5

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