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Subsequent Event - Additional Information (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2019 | Dec. 28, 2018 | Dec. 29, 2017 | Dec. 30, 2016 | Dec. 28, 2019 | Jan. 29, 2019 | Oct. 18, 2016 | Oct. 20, 2015
Common Stock, Dividends, Per Share, Declared |  | $ 0.52 | $ 0.42 | $ 0.36 |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 35,000,000 | $ 35,000,000
PG and E [Member] |  |  |  |  |  |  |  |
Customer Accounts Receivable |  | $ 5,600,000 |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.16 |  |  |  |  |  |  |
Dividends Payable, Date of Record | Mar. 08, 2019 |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ 75,000,000 |  |  |  |  |  |  |
Dividends Payable, Date to be Paid | Mar. 22, 2019 |  |  |  |  |  |  |
Subsequent Event [Member] | PG and E [Member] |  |  |  |  |  |  |  |
Subsequent Cash Receipt Customer Accounts Receivable |  |  |  |  | $ 2,100,000 |  |  |
Customer Accounts Receivable |  |  |  |  |  | $ 6,000,000 |  |

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- Definition Customer Accounts Receivable + References No definition available. + Details
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- Definition Subsequent Cash Receipt Customer Accounts Receivable + References No definition available. + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Details
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- Details
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