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Goodwill and Acquired Intangible Assets (Narrative) (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) segments | Apr. 02, 2016 segments | Sep. 30, 2016 USD ($) segments | Sep. 30, 2015 USD ($)
Number of reportable segments | segments | 3 | 2 | 3 |
Estimated aggregate future amortization expense for intangible assets, 2016 | $ 58.0 |  | $ 58.0 |
Estimated aggregate future amortization expense for intangible assets, 2017 | 57.0 |  | 57.0 |
Estimated aggregate future amortization expense for intangible assets, 2018 | 49.9 |  | 49.9 |
Estimated aggregate future amortization expense for intangible assets, 2019 | 47.2 |  | 47.2 |
Estimated aggregate future amortization expense for intangible assets, 2020 | 41.8 |  | 41.8 |
Estimated aggregate future amortization expense for intangible assets, thereafter | 56.5 |  | 56.5 |
Solutions Group [Member] |  |  |  |
Goodwill and acquired intangible assets | 1,196.6 |  | 1,196.6 |
Technology Platform Group [Member] |  |  |  |
Goodwill and acquired intangible assets | 252.8 |  | 252.8 |
Professional Services [Member] |  |  |  |
Goodwill and acquired intangible assets | $ 30.7 |  | $ 30.7 |
Software Products [Member] |  |  |  |
Goodwill and acquired intangible assets |  |  |  | $ 1,297.9
Services [Member] |  |  |  |
Goodwill and acquired intangible assets |  |  |  | $ 62.4

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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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