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Preferred and Common Stockholder's Equity (Tables) | 6 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Summary of Common Shares Issued and Outstanding | Common shares issued and outstanding
|  | Six months ended |  |  | Year ended |
|  | December 31, |  |  | June 30, |
|  | 2018 |  |  | 2018 |
Common stock issued and outstanding at July 1 |  |  | 70.6 |  |  |  | 68.4 |
Common stock issued upon exercise of options and employee stock plans |  |  | 4.2 |  |  |  | 2.2 |
Repurchase and retirement of common stock |  |  | (1.6 | ) |  |  | — |
Common stock issued and outstanding at end of period |  |  | 73.2 |  |  |  | 70.6 |
Reconciliation of Denominators of Basic and Diluted Earnings Per Share Computations | The following is a reconciliation of the denominators of the basic and diluted earnings per share (“EPS”) computations:
|  | Three months ended |  |  | Six months ended |
|  | December 31, |  |  | December 31, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average shares outstanding used to compute basic EPS |  |  | 74.2 |  |  |  | 69.3 |  |  |  | 73.6 |  |  |  | 68.9 |
Effect of dilutive shares |  |  | 2.3 |  |  |  | 2.6 |  |  |  | 3.3 |  |  |  | 2.3 |
Weighted-average shares outstanding and dilutive securities used to compute diluted EPS |  |  | 76.5 |  |  |  | 71.9 |  |  |  | 76.9 |  |  |  | 71.2 |
Schedule of Anti-Dilutive Options and Restricted Stock Units Excluded from EPS Computation | These potential dilutive common shares, which may be dilutive to future diluted earnings per share, are as follows:
|  | Three months ended |  |  | Six months ended |
|  | December 31, |  |  | December 31, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Anti-dilutive options and RSU's excluded from EPS computation |  |  | 1.1 |  |  |  | 0.2 |  |  |  | 0.6 |  |  |  | 0.5 |
Schedule of Stock Repurchases | The shares retired, aggregate common stock and additional paid-in capital reductions, and related charges to accumulated deficit for the repurchases for periods ended December 31, 2018 and 2017 were as follows:
|  | Three months ended |  |  | Six months ended |
|  | December 31, |  |  | December 31, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Shares purchased and retired |  |  | 1.6 |  |  |  | — |  |  |  | 1.6 |  |  |  | — |
Common stock and additional paid-in-capital reductions |  | $ | 16.9 |  |  | $ | — |  |  | $ | 16.9 |  |  | $ | — |
Charges to retained earnings |  | $ | 33.1 |  |  | $ | — |  |  | $ | 33.1 |  |  | $ | — |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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