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Property And Equipment (Narrative) (Details) $ in Millions | 12 Months Ended
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Apr. 30, 2018 USD ($) office | Apr. 30, 2017 USD ($) | Apr. 30, 2016 USD ($)
Property, Plant and Equipment, Net [Abstract] |  |  |
Document Fiscal Year Focus | 2018 |  |
Depreciation and amortization expense of property and equipment | $ | $ 103.4 | $ 103.2 | $ 100.8
Tax offices closed | office | 400 |  |

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- Definition The expense recognized in the current period that allocates the cost of nonproduction tangible assets over their useful lives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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