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Business Acquisitions (Tables) | 12 Months Ended
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Mar. 31, 2019
Microsemi Corporation |
Business Acquisition [Line Items] |
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed | The table below represents the allocation of the purchase price to the net assets acquired based on their estimated fair values, as well as the associated estimated useful lives of the acquired intangible assets (in millions).
| Previously reported December 31, 2018 |  | Adjustments |  | March 31, 2019
Assets acquired |  |  |  |  |
Cash and cash equivalents | $ | 340.0 |  |  | $ | — |  |  | $ | 340.0 |
Accounts receivable | 216.1 |  |  | (0.5 | ) |  | 215.6 |
Inventories | 571.5 |  |  | 4.7 |  |  | 576.2 |
Other current assets | 85.2 |  |  | — |  |  | 85.2 |
Property, plant and equipment | 201.9 |  |  | (0.4 | ) |  | 201.5 |
Goodwill | 4,483.0 |  |  | (118.1 | ) |  | 4,364.9 |
Purchased intangible assets | 5,466.9 |  |  | 167.6 |  |  | 5,634.5 |
Long-term deferred tax assets | 6.0 |  |  | (0.1 | ) |  | 5.9 |
Other assets | 57.2 |  |  | (3.9 | ) |  | 53.3 |
Total assets acquired | 11,427.8 |  |  | 49.3 |  |  | 11,477.1 |
Liabilities assumed |  |  |  |  |
Accounts payable | (233.8 | ) |  | — |  |  | (233.8 | )
Other current liabilities | (169.4 | ) |  | 20.1 |  |  | (149.3 | )
Long-term debt | (2,056.9 | ) |  | — |  |  | (2,056.9 | )
Deferred tax liabilities | (604.7 | ) |  | 39.6 |  |  | (565.1 | )
Long-term income tax payable | (87.2 | ) |  | (90.5 | ) |  | (177.7 | )
Other long-term liabilities | (31.3 | ) |  | (18.5 | ) |  | (49.8 | )
Total liabilities assumed | (3,183.3 | ) |  | (49.3 | ) |  | (3,232.6 | )
Purchase price allocated | $ | 8,244.5 |  |  | $ | — |  |  | $ | 8,244.5 |
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination |
Purchased Intangible Assets | Weighted Average |  |
| Useful Life |  | May 29, 2018
| (in years) |  | (in millions)
Core and developed technology | 15 |  | $ | 4,569.1 |
In-process research and development | — |  | 847.1 |
Customer-related | 12 |  | 200.2 |
Backlog | 1 |  | 12.3 |
Other | 4 |  | 5.8 |
Total purchased intangible assets |  |  | $ | 5,634.5 |
Schedule of Pro Forma Information | The pro-forma results of operations are presented for informational purposes only and are not indicative of the results of operations that would have been achieved if the acquisition had taken place on April 1, 2017 or of results that may occur in the future (in millions except per share data):
| Year Ended March 31,
| 2019 |  | 2018
Net sales | $ | 5,563.7 |  |  | $ | 5,875.0 |
Net income (loss) | $ | 542.0 |  |  | $ | (762.3 | )
Basic net income (loss) per common share | $ | 2.29 |  |  | $ | (3.27 | )
Diluted net income (loss) per common share | $ | 2.17 |  |  | $ | (3.27 | )
Atmel Corporation |
Business Acquisition [Line Items] |
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed | The table below represents the allocation of the final purchase price to the net assets acquired based on their estimated fair values, as well as the associated estimated useful lives of the acquired intangible assets (amounts in millions).
Assets acquired |  |
Cash and cash equivalents |  | $ | 230.2 |
Accounts receivable |  | 141.4 |
Inventories |  | 335.1 |
Prepaid expenses and other current assets |  | 28.4 |
Assets held for sale |  | 32.0 |
Property, plant and equipment |  | 129.9 |
Goodwill |  | 1,286.4 |
Purchased intangible assets |  | 1,888.4 |
Long-term deferred tax assets |  | 46.7 |
Other assets |  | 7.5 |
Total assets acquired |  | 4,126.0 |
Liabilities assumed |  |
Accounts payable |  | (55.7 | )
Other current liabilities |  | (121.0 | )
Long-term line of credit |  | (192.0 | )
Deferred tax liabilities |  | (27.5 | )
Long-term income tax payable |  | (115.1 | )
Other long-term liabilities |  | (141.7 | )
Total liabilities assumed |  | (653.0 | )
Purchase price allocated |  | $ | 3,473.0 |
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination |
Purchased Intangible Assets | Weighted Average |  |
| Useful Life |  | April 4, 2016
| (in years) |  | (in millions)
Core and developed technology | 11 |  | $ | 1,075.0 |
In-process research and development | — |  | 140.7 |
Customer-related | 6 |  | 630.6 |
Backlog | 1 |  | 40.3 |
Other | 5 |  | 1.8 |
Total purchased intangible assets |  |  | $ | 1,888.4 |

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