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Restructuring and Relocation Activities - Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Mar. 31, 2017
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Restructuring Cost And Reserve [Line Items] |  |
Restructuring expected accrual to pay |  | $ 35.1
Restructuring expected accrual remaining to pay |  | $ 1.6
Scenario, Forecast [Member] | Fusion Program | Building Cost Of Charlotte Campus |  |
Restructuring Cost And Reserve [Line Items] |  |
Total estimated net cash cost | $ 120.0 |

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- Definition Amount expected to be recognized in earnings for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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