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Acquisitions (Tables) | 3 Months Ended
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Mar. 30, 2019
Business Combinations [Abstract] |
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed | The following table summarizes the purchase price allocation of the fair value of assets acquired and liabilities assumed in the IXYS acquisition:
(in thousands) | Purchase Price Allocation
Total purchase consideration: |
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 | 382,360 |
Other non-current assets | 28,706 |
Other non-current liabilities | (78,370 | )
| $ | 778,788 |
Business Acquisition, Pro Forma Information | The pro forma amounts presented are not necessarily indicative of either the actual consolidated results had the IXYS acquisition occurred as of January 1, 2017 or of future consolidated operating results.
|  | Three Months Ended
(in thousands, except per share amounts) |  | March 31, 2018
Net sales |  | $ | 434,526 |
Income before income taxes |  | 81,924 |
Net income |  | 63,933 |
Net income per share — basic |  | 2.57 |
Net income per share — diluted |  | 2.53 |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustments | Pro forma results presented above primarily reflect the following adjustments:
|  | Three Months Ended
(in thousands) |  | March 31, 2018
Amortization(a) |  | $ | 1,902 |
Transaction costs(b) |  | 9,976 |
Amortization of inventory step-up(c) |  | 17,896 |
Stock compensation(d) |  | 4,479 |
Income tax impact of above items |  | (7,701 | )
(a) | The amortization adjustment for the three months ended March 31, 2018 primarily reflects the reduction of amortization expense in the period related to the Order backlog intangible asset. The Order backlog has a useful life of twelve months and was fully amortized in the fiscal 2017 pro forma results.
(b) | The transaction cost adjustments reflect the reversal of certain bank and attorney fees from the three months ended March 31, 2018 and recognition of those fees during the three months ended April 1, 2017.
(c) | The amortization of inventory step-up adjustment reflects the reversal of the amount recognized during the three months ended March 31, 2018 and recognition of those fees during the three months ended April 1, 2017. The inventory step-up was amortized over five months as the inventory was sold.
(d) | The stock compensation adjustment reflects the reversal of the portion of stock compensation for IXYS stock options that were converted to Littelfuse stock options and expensed immediately during the three months ended March 31, 2018.

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- Definition Tabular disclosure of the nature and amount of any material, nonrecurring adjustments directly attributable to the business combination(s) included in the reported pro forma revenue and earnings (supplemental pro forma information). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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