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Prepaid Expenses and Other Assets, and Other Assets (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 30, 2013 | Dec. 29, 2012
Prepaid expenses and other assets |  |
Forgivable Loans and term loans to employees and non-employee experts | $ 5,194,000 | $ 11,875,000
Income taxes receivable | 5,382,000 | 4,104,000
Prepaid insurance | 1,717,000 | 1,330,000
Subscriptions and licenses | 1,477,000 | 1,395,000
Prepaid rent and deposits | 773,000 | 968,000
Other | 3,436,000 | 3,329,000
Total | 17,979,000 | 23,001,000
Other assets |  |
Forgivable loans and term loans to employees and non-employee experts | 53,230,000 | 17,364,000
Other | 3,786,000 | 4,307,000
Total | 57,016,000 | 21,671,000
Prepaid expenses and other assets disclosures |  |
Term of forgivable loans or advances to employees and non-employee experts, minimum | 3 years |
Term of forgivable loans or advances to employees and non-employee experts, maximum | 8 years |
Forgivable loans issued to employees and non-employee experts for future service | 9,900,000 |
Forgivable loans issuable to employees and non-employee experts for future service | 21,500,000 |
Forgivable loans expected to be issued to employees and non-employee in second quarter of fiscal 2013 | 21,500,000 |
Estimated compensation to be paid to employees of the acquired entity based upon their performance |  | 6,200,000
Period over which, estimated compensation is paid to employees of the acquired entity based upon their performance | 7 years 6 months |
Amount of additional award granted | $ 3,800,000 |
Period over which estimated additional compensation is paid to employees of the acquired entity based on their performance | 4 years |

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