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Acquisitions - Preliminary Price Allocation (Details) - USD ($) $ in Thousands |  |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 17, 2018 | Jul. 07, 2017 | Mar. 01, 2017 | Feb. 28, 2017 | Sep. 29, 2018 | Sep. 30, 2017 | Dec. 30, 2017
Total purchase consideration: |  |  |  |  |  |  |
Cash, net of cash acquired |  |  |  |  | $ 313,475 | $ 38,610 |
Non-cash, fair value of commitment to purchase non-controlling interest |  |  |  |  | 5,000 | $ 9,000 |
Allocation of consideration to assets acquired and liabilities assumed: |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 830,354 |  | $ 453,414
IXYS Corporation |  |  |  |  |  |  |
Total purchase consideration: |  |  |  |  |  |  |
Cash | $ 380,600 |  |  |  |  |  |
Cash, net of cash acquired | 302,865 |  |  |  |  |  |
Cash settled stock options | 3,622 |  |  |  |  |  |
Littelfuse stock | 434,192 |  |  |  |  |  |
Converted stock options | 38,109 |  |  |  |  |  |
Total purchase consideration | 778,788 |  |  |  |  |  |
Allocation of consideration to assets acquired and liabilities assumed: |  |  |  |  |  |  |
Current assets, net | 155,930 |  |  |  |  |  |
Property, plant, and equipment | 77,442 |  |  |  |  |  |
Intangible assets | 212,720 |  |  |  |  |  |
Goodwill | 379,619 |  |  |  |  |  |
Other non-current assets | 31,570 |  |  |  |  |  |
Other non-current liabilities | (78,493) |  |  |  |  |  |
Assets acquired and liabilities assumed | $ 778,788 |  |  |  |  |  |
U.S. Sensor |  |  |  |  |  |  |
Total purchase consideration: |  |  |  |  |  |  |
Cash |  | $ 24,340 |  |  |  |  |
Allocation of consideration to assets acquired and liabilities assumed: |  |  |  |  |  |  |
Current assets, net |  | 4,635 |  |  |  |  |
Goodwill |  | 16,075 |  |  |  |  |
Current liabilities |  | (540) |  |  |  |  |
Assets acquired and liabilities assumed |  | 24,340 |  |  |  |  |
U.S. Sensor | Patented and unpatented technologies |  |  |  |  |  |  |
Allocation of consideration to assets acquired and liabilities assumed: |  |  |  |  |  |  |
Intangible assets |  | 1,090 |  |  |  |  |
U.S. Sensor | Trademarks and tradenames |  |  |  |  |  |  |
Allocation of consideration to assets acquired and liabilities assumed: |  |  |  |  |  |  |
Intangible assets |  | 200 |  |  |  |  |
U.S. Sensor | Non-compete agreement |  |  |  |  |  |  |
Allocation of consideration to assets acquired and liabilities assumed: |  |  |  |  |  |  |
Intangible assets |  | 50 |  |  |  |  |
U.S. Sensor | Customer relationships |  |  |  |  |  |  |
Allocation of consideration to assets acquired and liabilities assumed: |  |  |  |  |  |  |
Intangible assets |  | $ 2,830 |  |  |  |  |
Monolith |  |  |  |  |  |  |
Total purchase consideration: |  |  |  |  |  |  |
Original investment |  |  | $ 3,500 |  |  |  |
Cash, net of cash acquired |  |  | 14,172 | $ 14,200 |  |  |
Non-cash, fair value of commitment to purchase non-controlling interest |  |  | 9,000 | 9,000 |  |  |
Total purchase consideration |  |  | 26,672 | $ 26,700 |  |  |
Allocation of consideration to assets acquired and liabilities assumed: |  |  |  |  |  |  |
Current assets, net |  |  | 891 |  |  |  |
Property, plant, and equipment |  |  | 789 |  |  |  |
Goodwill |  |  | 20,641 |  |  |  |
Other non-current liabilities |  |  | (1,870) |  |  |  |
Current liabilities |  |  | (639) |  |  |  |
Assets acquired and liabilities assumed |  |  | 26,672 |  |  |  |
Monolith | Patented and unpatented technologies |  |  |  |  |  |  |
Allocation of consideration to assets acquired and liabilities assumed: |  |  |  |  |  |  |
Intangible assets |  |  | 6,720 |  |  |  |
Monolith | Non-compete agreement |  |  |  |  |  |  |
Allocation of consideration to assets acquired and liabilities assumed: |  |  |  |  |  |  |
Intangible assets |  |  | $ 140 |  |  |  |

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