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Schedule of Valuation and Qualifying Accounts | 12 Months Ended
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Jun. 30, 2018
Valuation And Qualifying Accounts [Abstract] |
Schedule of Valuation and Qualifying Accounts | MYRIAD GENETICS, INC. Schedule of Valuation and Qualifying Accounts Years Ended June 30, 2018, 2017 and 2016 (In millions)
|  | Balance at Beginning of Period |  |  | Addition Charged to Cost and Expenses |  |  | Net Deductions and Other (1) |  |  | Balance at End of Period |
Allowance for doubtful accounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ended June 30, 2018 |  | $ | 8.2 |  |  | $ | 32.3 |  |  | $ | (28.4 | ) |  | $ | 12.1 |
Year ended June 30, 2017 |  | $ | 6.8 |  |  | $ | 37.3 |  |  | $ | (35.9 | ) |  | $ | 8.2 |
Year ended June 30, 2016 |  | $ | 7.6 |  |  | $ | 33.3 |  |  | $ | (34.1 | ) |  | $ | 6.8 |
(1) | Primarily represents the write-off of accounts receivables net of recoveries.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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