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Supplementary Quarterly Financial Information - Results By Quarter (Unaudited) (Tables) | 12 Months Ended
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Apr. 30, 2021
Supplementary Quarterly Financial Information - Results By Quarter (Unaudited) [Abstract] |
Quarterly Financial Information |
Amounts in millions, except per share data |  | 2021 |  |  | 2020 |
Revenue, net |  |  |  |  |  |
First quarter |  | $ | 431.3 |  |  | $ | 423.5 |
Second quarter |  |  | 491.0 |  |  |  | 466.2 |
Third quarter |  |  | 482.9 |  |  |  | 467.1 |
Fourth quarter |  |  | 536.3 |  |  |  | 474.7 |
Year ended April 30, |  | $ | 1,941.5 |  |  | $ | 1,831.5 |
Gross profit |  |  |  |  |  |  |  |
First quarter |  | $ | 286.5 |  |  | $ | 280.4 |
Second quarter |  |  | 336.2 |  |  |  | 322.8 |
Third quarter |  |  | 325.3 |  |  |  | 313.2 |
Fourth quarter |  |  | 368.2 |  |  |  | 324.1 |
Year ended April 30, |  | $ | 1,316.2 |  |  | $ | 1,240.5 |
Operating income (loss) |  |  |  |  |  |  |  |
First quarter |  | $ | 30.0 |  |  | $ | 4.5 |
Second quarter |  |  | 69.9 |  |  |  | 63.4 |
Third quarter |  |  | 34.4 |  |  |  | 48.5 |
Fourth quarter |  |  | 51.2 |  |  |  | (170.7 | )
Year ended April 30, |  | $ | 185.5 |  |  | $ | (54.3 | )
Net income (loss) |  |  |  |  |  |  |  |
First quarter |  | $ | 16.3 |  |  | $ | 3.6 |
Second quarter |  |  | 68.4 |  |  |  | 44.7 |
Third quarter |  |  | 22.2 |  |  |  | 35.4 |
Fourth quarter |  |  | 41.4 |  |  |  | (158.0 | )
Year ended April 30, |  | $ | 148.3 |  |  | $ | (74.3 | )
|  | 2021 |  |  | 2020 |
|  | Basic |  |  | Diluted |  |  | Basic |  |  | Diluted |
Earnings (loss) per share (1) |  |  |  |  |  |  |  |  |  |  |  |
First quarter |  | $ | 0.29 |  |  | $ | 0.29 |  |  | $ | 0.06 |  |  | $ | 0.06 |
Second quarter |  |  | 1.22 |  |  |  | 1.22 |  |  |  | 0.79 |  |  |  | 0.79 |
Third quarter |  |  | 0.40 |  |  |  | 0.39 |  |  |  | 0.63 |  |  |  | 0.63 |
Fourth quarter (2) |  |  | 0.74 |  |  |  | 0.73 |  |  |  | (2.83 | ) |  |  | (2.83 | )
Year ended April 30, (2) |  | $ | 2.65 |  |  | $ | 2.63 |  |  | $ | (1.32 | ) |  | $ | (1.32 | )
(1) | The sum of the quarterly earnings (loss) per share amounts may not agree to the respective annual amounts due to rounding.
(2) | In calculating diluted earnings (loss) per common share for the fourth quarter and year ended April 30, 2020, our diluted weighted average number of common shares outstanding excludes the effect of unvested restricted stock units and other stock awards as the effect was anti-dilutive. This occurs when a US GAAP net loss is reported and the effect of using dilutive shares is antidilutive.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124502072&loc=d3e1280-108306 + Details
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