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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 | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Sep. 30, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |
Document Fiscal Year Focus |  |  | 2017 |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share | $ (0.30) | $ (0.24) | $ 0.88 | $ (0.30) |
Weighted Average Number of Shares Outstanding, Diluted | 199,981 | 201,062 | 199,579 | 201,370 |
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  |  | $ (50.1) |
Net income (loss) attributable to common and participating preferred stockholders | $ (82.1) | $ (24.7) | $ 130.1 | (58.6) |
Net Income (Loss) Attributable to Parent | (82.1) | (24.7) | 130.1 | (58.6) |
Income (Loss) from Continuing Operations Attributable to Parent | $ (21.3) | $ 24.5 | $ (46.8) | $ 2.7 |
Participating shares at end of period: |  |  |  |  |
Weighted-average common shares outstanding - basic | 199,981 | 198,521 | 199,579 | 198,068 |
Net (loss) income per common share attributable to controlling interest: |  |  |  |  |
Basic (in dollars per share) | $ (0.41) | $ (0.12) | $ 0.65 | $ (0.30) |
Income (Loss) from Continuing Operations, Per Diluted Share | (0.11) | 0.12 | (0.23) | 0.01 |
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share | (0.30) | (0.24) | 0.88 | (0.31) |
Earnings Per Share, Diluted | (0.41) | (0.12) | 0.65 | (0.29) |
Income (Loss) from Continuing Operations, Per Basic Share | $ (0.11) | $ 0.12 | $ (0.23) | $ 0.01 |
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 |  | 1,040 |  | 1,172 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 1,820 |  | 1,708 |  |
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 |  | 1,501 |  | 2,130 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 393 |  | 846 |  |
Warrant [Member] |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 235 |  | 177 |  |
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
Discontinued Operations, Held-for-sale [Member] |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent | $ (60.8) | $ (49.2) |  |  |
Discontinued Operations, Held-for-sale [Member] | HGI [Member] |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |
Net Income (Loss) Attributable to Parent |  |  | $ 176.9 | $ (61.3) |

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