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Other Financial Statement Details | 12 Months Ended
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Mar. 31, 2018
Accounts Receivable, Net [Abstract] |
Other Financial Statement Details | Other Financial Statement Details Accounts Receivable Accounts receivable consists of the following (amounts in millions):
| March 31,
| 2018 |  | 2017
Trade accounts receivable | $ | 557.8 |  |  | $ | 473.3 |
Other | 8.1 |  |  | 7.2 |
Total accounts receivable, gross | 565.9 |  |  | 480.5 |
Less allowance for doubtful accounts | 2.2 |  |  | 2.1 |
Total accounts receivable, net | $ | 563.7 |  |  | $ | 478.4 |
Inventories The components of inventories consist of the following (amounts in millions):
| March 31,
| 2018 |  | 2017
Raw materials | $ | 26.0 |  |  | $ | 14.4 |
Work in process | 311.8 |  |  | 268.3 |
Finished goods | 138.4 |  |  | 134.5 |
Total inventories | $ | 476.2 |  |  | $ | 417.2 |
Inventories are valued at the lower of cost and net realizable value using the first-in, first-out method. Inventory impairment charges establish a new cost basis for inventory and charges are not subsequently reversed to income even if circumstances later suggest that increased carrying amounts are recoverable. Property, Plant and Equipment Property, plant and equipment consists of the following (amounts in millions):
| March 31,
| 2018 |  | 2017
Land | $ | 73.4 |  |  | $ | 73.4 |
Building and building improvements | 508.5 |  |  | 499.7 |
Machinery and equipment | 1,943.9 |  |  | 1,774.9 |
Projects in process | 118.3 |  |  | 104.3 |
Total property, plant and equipment, gross | 2,644.1 |  |  | 2,452.3 |
Less accumulated depreciation and amortization | 1,876.2 |  |  | 1,769.0 |
Total property, plant and equipment, net | $ | 767.9 |  |  | $ | 683.3 |
Depreciation expense attributed to property, plant and equipment was $123.7 million, $122.9 million and $103.9 million for the fiscal years ending March 31, 2018, 2017 and 2016, respectively. During the quarter ended March 31, 2018, the Company entered into an agreement to purchase one of the buildings it leased in San Jose, California for a purchase price of $40.8 million with a closing date of April 4, 2018. During the quarter ended December 31, 2016, the Company began to actively market a 6-inch wafer fabrication facility it acquired as part of its acquisition of Micrel in August 2015. In the three months ended June 30, 2017, the Company completed the sale of these assets for proceeds of $10.0 million. As of March 31, 2017, these assets consisting of property, plant and equipment were presented as held for sale in the Company's consolidated financial statements.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5066-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(6)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5162-111524 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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