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Reconciliation of Weighted Average Shares Outstanding (Details) - shares	3 Months Ended		6 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Reconciliation of Weighted Average Shares Outstanding [Abstract]
Weighted average shares outstanding (in shares)	56,339,000	57,426,000	56,451,000	57,451,000
Less: Unvested restricted shares (in shares)	(13,000)	(47,000)	(20,000)	(59,000)
Shares used for basic earnings per share (in shares)	56,326,000	57,379,000	56,431,000	57,392,000
Dilutive effect of stock options and other stock awards (in shares)	338,000	491,000	360,000	563,000
Shares used for diluted earnings per share (in shares)	56,664,000	57,870,000	56,791,000	57,955,000
Stock Options [Member] | Class A Common [Member]
Reconciliation of Weighted Average Shares Outstanding and Share Repurchases [Abstract]
Anti-dilutive shares excluded from diluted EPS calculation (in shares)	212,094	157,167	212,094	157,167
Warrants [Member]
Reconciliation of Weighted Average Shares Outstanding and Share Repurchases [Abstract]
Warrants issued during period (in shares)		0		0
Warrants [Member] | Class A Common [Member]
Reconciliation of Weighted Average Shares Outstanding and Share Repurchases [Abstract]
Anti-dilutive shares excluded from diluted EPS calculation (in shares)	515,114		515,114
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	0	0

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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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 number of warrants issued as [noncash or part noncash] consideration for a business or asset acquired. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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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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