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Earnings Per Share - Summary of Basic and Diluted EPS (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2015 | Mar. 31, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Sep. 30, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements | 1,319 |  |  |  |  |  |
Document Fiscal Year Focus |  |  |  |  | 2016 |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share | $ (1.04) |  | $ 0.44 |  | $ (1.34) | $ 0.55 |
Net Income (Loss) Available to Common Stockholders, Basic | $ (132.9) |  | $ (75.6) |  |  |  |
Weighted Average Number of Shares Outstanding, Diluted | 201,626 |  | 196,878 |  | 201,443 | 197,920 |
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  |  |  |  | $ 125.7 |
Net income (loss) attributable to common and participating preferred stockholders | $ (132.9) |  | $ (75.6) |  | $ (191.5) | (413.7) |
Net Income (Loss) Attributable to Parent | (132.9) | $ (24.7) | (75.6) | $ (58.6) | (191.5) | (413.7) |
Income (Loss) from Continuing Operations Attributable to Parent | $ 77.4 |  | $ (161.9) |  | $ 78.7 | $ (522.3) |
Dilutive adjustments to income (loss) attributable to common shares from assumed conversion of preferred shares, net of tax: |  |  |  |  |  |  |
Weighted-average common shares outstanding - basic | 198,589 |  | 196,878 |  | 198,256 | 197,920 |
Net loss per common share attributable to controlling interest: |  |  |  |  |  |  |
Basic (in dollars per share) | $ (0.67) | $ (0.12) | $ (0.38) | $ (0.30) | $ (0.97) | $ (2.09) |
Income (Loss) from Continuing Operations, Per Diluted Share | 0.38 | (0.01) | (0.82) | 0.04 | 0.39 | (2.64) |
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share | (1.06) |  | 0.44 |  | (1.37) | 0.55 |
Earnings Per Share, Diluted | (0.66) | (0.12) | (0.38) | (0.30) | (0.95) | (2.09) |
Income (Loss) from Continuing Operations, Per Basic Share | $ 0.39 | $ (0.01) | $ (0.82) | $ 0.04 | $ 0.40 | $ (2.64) |
Stock option awards [Member] |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements |  |  |  |  | 1,223 |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 |  | 1,282 |  | 0 | 1,358 |
Restricted stock awards [Member] |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |
Incremental Common Shares Attributable To Conversion Of Restricted Stock Units | 1,718 |  |  |  | 1,964 |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 |  | 3,014 |  | 0 | 2,701 |
HGI [Member] | Warrant [Member] |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  |  |  |  | $ 13.13 |  | $ 13.13

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