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Reconciliation of Weighted Average Shares Outstanding (Details) - shares	3 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Reconciliation of Weighted Average Shares Outstanding [Abstract]
Weighted average shares outstanding (in shares)	55,916,000	56,564,000
Less: Unvested restricted shares (in shares)	(4,000)	(28,000)
Shares used for basic earnings per share (in shares)	55,912,000	56,536,000
Dilutive effect of unvested restricted stock units and other stock awards (in shares)	281,000	369,000
Shares used for diluted earnings per share (in shares)	56,193,000	56,905,000
Stock Options [Member] | Class A Common Stock [Member]
Reconciliation of Weighted Average Shares Outstanding and Share Repurchases [Abstract]
Anti-dilutive shares excluded from diluted EPS calculation (in shares)	201,743	252,704
Restricted Stock [Member]
Reconciliation of Weighted Average Shares Outstanding and Share Repurchases [Abstract]
Anti-dilutive shares excluded from diluted EPS calculation (in shares)	0	0
Warrants [Member] | Class A Common Stock [Member]
Reconciliation of Weighted Average Shares Outstanding and Share Repurchases [Abstract]
Anti-dilutive shares excluded from diluted EPS calculation (in shares)	528,452	511,094

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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-Section 50
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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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Number of shares of restricted stock determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Restricted shares are subject to sales, contractual, regulatory or other restrictions that prevent or inhibit the holder from freely disposing of them before the restriction ends.

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