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Investment in Leasing Operations: Risk Concentration (Details) - Total assets - customer | 12 Months Ended
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Dec. 26, 2015 | Dec. 27, 2014
Investment in leasing operations |  |
Number of customers | 3 | 2
Customer One Concentration Risk |  |
Investment in leasing operations |  |
Percentage of concentration risk | 17.00% | 15.00%
Customer Two Concentration Risk |  |
Investment in leasing operations |  |
Percentage of concentration risk | 12.00% | 10.00%
Customer Three Concentration Risk Member |  |
Investment in leasing operations |  |
Percentage of concentration risk | 11.00% |

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