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Reconciliation of Weighted Average Shares Outstanding and Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 6 Months Ended
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Oct. 24, 2018 | Sep. 26, 2018 | Jul. 18, 2018 | Jun. 21, 2018 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2017
Reconciliation of Weighted Average Shares Outstanding and Share Repurchases [Abstract] |  |  |  |  |  |  |  |
Weighted average shares outstanding (in shares) |  |  |  |  | 57,426,000 | 57,013,000 | 57,451,000 | 57,100,000
Less: Unvested restricted shares (in shares) |  |  |  |  | (47,000) | (138,000) | (59,000) | (152,000)
Shares used for basic earnings per share (in shares) |  |  |  |  | 57,379,000 | 56,875,000 | 57,392,000 | 56,948,000
Dilutive effect of stock options and other stock awards (in shares) |  |  |  |  | 491,000 | 679,000 | 563,000 | 685,000
Shares used for diluted earnings per share (in shares) |  |  |  |  | 57,870,000 | 57,554,000 | 57,955,000 | 57,633,000
Reconciliation of Weighted Average Shares Outstanding and Share Repurchases [Abstract] |  |  |  |  |  |  |  |
Shares repurchased (in shares) |  |  |  |  | 299,188 | 285,599 | 425,120 | 550,757
Average purchase price (in dollars per share) |  |  |  |  | $ 56.82 | $ 53.37 | $ 58.79 | $ 53.12
Cash dividend [Abstract] |  |  |  |  |  |  |  |
Cash dividends | $ 18,900 |  | $ 19,000 |  |  |  | $ 38,033 | $ 36,699
Class A Common [Member] |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |
Common stock (in dollars per share) |  |  |  |  | 0.33 | 0.32 | $ 0.66 | $ 0.64
Class A Common [Member] | Dividend Declared in Q1 2019 [Member] |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |
Dividend declared date |  |  |  |  |  |  | Jun. 21, 2018 |
Common stock (in dollars per share) |  |  |  | $ 0.33 |  |  |  |
Dividend payable date |  |  |  |  |  |  | Jul. 18, 2018 |
Dividend record date |  |  |  |  |  |  | Jul. 03, 2018 |
Class A Common [Member] | Dividend Declared in Q2 2019 [Member] |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |
Dividend declared date |  |  |  |  |  |  | Sep. 26, 2018 |
Common stock (in dollars per share) |  | $ 0.33 |  |  |  |  |  |
Dividend payable date |  |  |  |  |  |  | Oct. 24, 2018 |
Dividend record date |  |  |  |  |  |  | Oct. 09, 2018 |
Class B Common [Member] |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |
Common stock (in dollars per share) |  |  |  |  | $ 0.33 | $ 0.32 | $ 0.66 | $ 0.64
Class B Common [Member] | Dividend Declared in Q1 2019 [Member] |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |
Dividend declared date |  |  |  |  |  |  | Jun. 21, 2018 |
Common stock (in dollars per share) |  |  |  | $ 0.33 |  |  |  |
Dividend payable date |  |  |  |  |  |  | Jul. 18, 2018 |
Dividend record date |  |  |  |  |  |  | Jul. 03, 2018 |
Class B Common [Member] | Dividend Declared in Q2 2019 [Member] |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |
Dividend declared date |  |  |  |  |  |  | Sep. 26, 2018 |
Common stock (in dollars per share) |  | $ 0.33 |  |  |  |  |  |
Dividend payable date |  |  |  |  |  |  | Oct. 24, 2018 |
Dividend record date |  |  |  |  |  |  | Oct. 09, 2018 |
Restricted Stock [Member] |  |  |  |  |  |  |  |
Reconciliation of Weighted Average Shares Outstanding and Share Repurchases [Abstract] |  |  |  |  |  |  |  |
Anti-dilutive shares excluded from diluted EPS calculation (in shares) |  |  |  |  | 0 | 26,740 | 0 | 26,740
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) |  |  |  |  | 157,167 | 284,787 | 157,167 | 284,787

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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