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Summary Of Significant Accounting Policies New Accounting Pronouncements (Details) - USD ($) $ in Millions | 9 Months Ended
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Jan. 31, 2018 | Jan. 31, 2017
Accounting Changes [Abstract] |  |
Increase in cash used in operations |  | $ 33.9
Discrete tax benefit related to stock-based compensation | $ 4.6 |
Minimum |  |
Accounting Changes [Abstract] |  |
Estimated cumulative-effect adjustment to retained earnings | 95.0 |
Maximum |  |
Accounting Changes [Abstract] |  |
Estimated cumulative-effect adjustment to retained earnings | $ 110.0 |

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- Definition Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22583-107794 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22499-107794 + Details
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