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Reconciliation of Weighted Average Shares Outstanding and Share Repurchases (Details) - $ / shares	3 Months Ended		6 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Reconciliation of Weighted Average Shares Outstanding and Share Repurchases [Abstract]
Weighted average shares outstanding (in shares)	57,013,000	57,759,000	57,100,000	57,717,000
Less: Unearned restricted shares (in shares)	(138,000)	(221,000)	(152,000)	(223,000)
Shares used for basic earnings per share (in shares)	56,875,000	57,538,000	56,948,000	57,494,000
Dilutive effect of stock options and other stock awards (in shares)	679,000	0	685,000	765,000
Shares used for diluted earnings per share (in shares)	57,554,000	57,538,000	57,633,000	58,259,000
Shares repurchased (in shares)	285,599	193,955	550,757	415,260
Average purchase price (in dollars per share)	$ 53.37	$ 51.56	$ 53.12	$ 51.27
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from diluted EPS calculation (in shares)	26,740			42,783
Stock Options [Member] | Class A Common [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from diluted EPS calculation (in shares)			284,787	315,425

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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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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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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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