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Income Taxes - Components of Income, Provision For and Reconciliation of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Jan. 02, 2016 | Oct. 03, 2015 | Jul. 04, 2015 | Apr. 04, 2015 | Dec. 31, 2016 | Jan. 02, 2016 | Jan. 03, 2015
Income before provision for income taxes: |  |  |  |  |  |  |  |  |  |  |
U.S. |  |  |  |  |  |  |  |  | $ 16,905 | $ 10,565 | $ 20,899
Foreign |  |  |  |  |  |  |  |  | 4,984 | 1,250 | 2,416
Income before provision for income taxes | $ 3,375 | $ 5,060 | $ 9,269 | $ 4,185 | $ (2,553) | $ 4,346 | $ 5,391 | $ 4,631 | 21,889 | 11,815 | 23,315
Currently payable: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | (770) | 5,104 | 8,585
Foreign |  |  |  |  |  |  |  |  | 664 | 546 | 876
State |  |  |  |  |  |  |  |  | (637) | 1,550 | 1,878
Currently payable |  |  |  |  |  |  |  |  | (743) | 7,200 | 11,339
Deferred: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 5,562 | (799) | (1,068)
Foreign |  |  |  |  |  |  |  |  | 124 | (307) | (505)
State |  |  |  |  |  |  |  |  | 2,713 | (604) | 142
Deferred |  |  |  |  |  |  |  |  | 8,399 | (1,710) | (1,431)
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | $ 7,656 | $ 5,490 | $ 9,908
Reconciliation of tax rates with federal statutory rate |  |  |  |  |  |  |  |  |  |  |
Federal statutory rate (as a percent) |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00%
State income taxes, net of federal income tax benefit (as a percent) |  |  |  |  |  |  |  |  | 6.10% | 5.40% | 3.60%
Tax law changes (as a percent) |  |  |  |  |  |  |  |  | (0.30%) |  |
Losses benefited (as a percent) |  |  |  |  |  |  |  |  | (5.00%) | (9.20%) | (1.80%)
Losses not benefited (as a percent) |  |  |  |  |  |  |  |  |  | 5.00% | 0.60%
Foreign rate differential (as a percent) |  |  |  |  |  |  |  |  | (3.30%) | (2.70%) | 0.60%
Foreign tax credit (as a percent) |  |  |  |  |  |  |  |  | (0.70%) |  |
Uncertain tax positions (as a percent) |  |  |  |  |  |  |  |  | (0.20%) | 8.70% | 0.70%
Nondeductible/nontaxable items (as a percent) |  |  |  |  |  |  |  |  | 3.00% | 6.80% | 2.10%
Prior period adjustments (as a percent) |  |  |  |  |  |  |  |  | (0.50%) | (0.60%) | 3.00%
Change in valuation allowance (as a percent) |  |  |  |  |  |  |  |  | 0.20% | (1.70%) | (2.20%)
GNU goodwill impairment (as a percent) |  |  |  |  |  |  |  |  |  | 13.40% |
GNU capital gain upon distribution (as a percent) |  |  |  |  |  |  |  |  | 1.10% |  |
GNU tax provision (benefit) (as a percent) |  |  |  |  |  |  |  |  | 0.20% | (13.60%) | 0.90%
Other (as a percent) |  |  |  |  |  |  |  |  | (0.60%) |  |
Effective tax rate (as a percent) |  |  |  |  |  |  |  |  | 35.00% | 46.50% | 42.50%

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported income tax expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign tax credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51673353&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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- Definition The increase (decrease) during the reporting period in the account that represents the temporary difference that results from Income or Loss that is recognized for accounting purposes but not for tax purposes and vice versa. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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