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Income Taxes (Tables) | 12 Months Ended
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Sep. 30, 2019
Income Taxes |
Schedule of income tax (benefit) expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fiscal Year Ended
​ |  | September 30, |  | September 30, |  | September 30,
​ | ​ | 2019 | ​ | 2018 | ​ | 2017
​ | ​ | (in millions)
Current: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | $ | 9.2 | ​ | $ | (122.4) | ​ | $ | 10.3
State | ​ |  | 45.4 | ​ |  | 19.0 | ​ |  | 17.9
Foreign | ​ |  | 43.2 | ​ |  | 47.1 | ​ |  | 29.3
Total current income tax expense (benefit) | ​ |  | 97.8 | ​ |  | (56.3) | ​ |  | 57.5
Deferred: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ |  | (67.0) | ​ |  | 14.5 | ​ |  | (8.3)
State | ​ |  | (41.7) | ​ |  | 39.0 | ​ |  | 10.4
Foreign | ​ |  | 10.8 | ​ |  | (16.8) | ​ |  | (51.9)
Total deferred income tax (benefit) expense | ​ |  | (97.9) | ​ |  | 36.7 | ​ |  | (49.8)
Total income tax (benefit) expense | ​ | $ | (0.1) | ​ | $ | (19.6) | ​ | $ | 7.7
​
Major elements contributing to the difference between the U.S. federal statutory rate of 24.5% for fiscal year 2018 and 35% for fiscal years ended 2017 and 2016 and the effective tax rate | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fiscal Year Ended |
​ | ​ | September 30, | ​ | September 30, | ​ | September 30, |
​ | ​ | 2019 | ​ | 2018 | ​ | 2017 |
​ |  | Amount |  | % |  | Amount |  | % |  | Amount |  | % |
​ | ​ | (in millions) |
Tax at federal statutory rate | ​ | $ | (38.7) |  | 21.0 | % | $ | 43.5 |  | 24.5 | % | $ | 150.3 |  | 35.0 | %
State income tax, net of federal benefit | ​ |  | 9.0 |  | (4.9) | ​ |  | 17.8 |  | 10.0 | ​ |  | 24.3 |  | 5.7 | ​
Impairment of goodwill, nondeductible for tax | ​ | ​ | 82.7 | ​ | (44.9) | ​ | ​ | 33.9 | ​ | 19.1 | ​ | ​ | — | ​ | — | ​
Foreign residual income | ​ | ​ | 28.9 | ​ | (15.7) | ​ | ​ | 10.3 | ​ | 5.8 | ​ | ​ | (9.2) | ​ | (2.1) | ​
Nondeductible costs | ​ | ​ | 9.2 | ​ | (5.0) | ​ | ​ | 3.5 | ​ | 1.9 | ​ | ​ | 5.8 | ​ | 1.4 | ​
Change in uncertain tax positions | ​ | ​ | 6.0 | ​ | (3.3) | ​ | ​ | (31.4) | ​ | (17.7) | ​ | ​ | 9.5 | ​ | 2.2 | ​
Return to provision, primarily foreign tax credits | ​ | ​ | 3.7 | ​ | (2.0) | ​ | ​ | (18.5) | ​ | (10.4) | ​ | ​ | — | ​ | — | ​
Income tax credits and incentives | ​ | ​ | (47.6) | ​ | 25.8 | ​ | ​ | (37.2) | ​ | (21.0) | ​ | ​ | (56.8) | ​ | (13.2) | ​
Valuation allowance | ​ | ​ | (20.3) | ​ | 11.0 | ​ | ​ | 58.7 | ​ | 33.1 | ​ | ​ | (51.2) | ​ | (11.9) | ​
Exclusion of tax on non-controlling interests | ​ | ​ | (16.3) | ​ | 8.9 | ​ | ​ | (14.9) | ​ | (8.4) | ​ | ​ | (28.2) | ​ | (6.6) | ​
Foreign tax rate differential | ​ | ​ | (4.8) | ​ | 2.6 | ​ | ​ | (1.6) | ​ | (0.9) | ​ | ​ | (19.2) | ​ | (4.5) | ​
Audit settlement | ​ | ​ | (4.6) | ​ | 2.5 | ​ | ​ | (27.7) | ​ | (15.6) | ​ | ​ | — | ​ | — | ​
Tax exempt income | ​ |  | (3.9) |  | 2.1 | ​ |  | (7.4) |  | (4.2) | ​ |  | (17.9) |  | (4.2) | ​
Impact of changes in tax law | ​ | ​ | (1.5) | ​ | 0.8 | ​ | ​ | (47.8) | ​ | (26.9) | ​ | ​ | — | ​ | — | ​
Other items, net | ​ | ​ | (1.9) | ​ | 1.2 | ​ | ​ | (0.8) | ​ | (0.4) | ​ | ​ | 0.3 | ​ | — | ​
Total income tax expense (benefit) | ​ | $ | (0.1) |  | 0.1 | % | $ | (19.6) |  | (11.1) | % | $ | 7.7 |  | 1.8 | %
​
Schedule of deferred tax assets (liabilities) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fiscal Year Ended
​ |  | September 30, |  | September 30,
​ | ​ | 2019 | ​ | 2018
​ | ​ | (in millions)
Deferred tax assets: | ​ | ​ | ​ | ​ | ​ | ​
Compensation and benefit accruals not currently deductible | ​ | $ | 132.9 | ​ | $ | 108.3
Net operating loss carryforwards | ​ |  | 228.2 | ​ |  | 252.4
Self-insurance reserves | ​ |  | 12.9 | ​ |  | 13.5
Research and experimentation and other tax credits | ​ |  | 120.5 | ​ |  | 178.1
Pension liability | ​ |  | 105.1 | ​ |  | 88.2
Accrued liabilities | ​ |  | 125.4 | ​ |  | 63.4
Other | ​ |  | 28.8 | ​ |  | 27.8
Total deferred tax assets | ​ |  | 753.8 | ​ |  | 731.7
Deferred tax liabilities: | ​ | ​ | ​ | ​ | ​ | ​
Unearned revenue | ​ |  | (106.9) | ​ |  | (121.1)
Depreciation and amortization | ​ |  | (78.5) | ​ |  | (135.9)
Acquired intangible assets | ​ |  | (49.6) | ​ |  | (56.0)
Investment in subsidiaries | ​ | ​ | (108.7) | ​ | ​ | (109.5)
Total deferred tax liabilities | ​ |  | (343.7) | ​ |  | (422.5)
Valuation allowance | ​ |  | (169.1) | ​ |  | (197.1)
Net deferred tax assets | ​ | $ | 241.0 | ​ | $ | 112.1
​
Reconciliation of the beginning and ending amount of gross unrecognized tax benefits | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fiscal Year Ended
​ |  | September 30, |  | September 30,
​ | ​ | 2019 | ​ | 2018
​ | ​ | (in millions)
Balance at the beginning of the year | ​ | $ | 60.0 | ​ | $ | 102.1
Gross increase in current period’s tax positions | ​ |  | 3.4 | ​ |  | 4.0
Gross increase in prior years’ tax positions | ​ |  | 0.8 | ​ |  | 2.2
Gross decrease in prior years’ tax positions | ​ |  | (1.0) | ​ |  | (14.4)
Decrease due to settlement with tax authorities | ​ |  | — | ​ |  | (31.9)
Decrease due to lapse of statute of limitations | ​ |  | — | ​ |  | (1.7)
Gross change due to foreign exchange fluctuations | ​ | ​ | (0.8) | ​ | ​ | (0.3)
Balance at the end of the year | ​ | $ | 62.4 | ​ | $ | 60.0
​

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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