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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 28, 2019 | May 30, 2019 | Apr. 17, 2019 | Jan. 16, 2019 | Oct. 24, 2018 | Jul. 18, 2018 | Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017 | Jul. 01, 2019
Dividend [Abstract] |  |  |  |  |  |  |  |  |  |
Cash dividends |  |  | $ 18,600 | $ 18,900 | $ 18,900 | $ 19,000 | $ 75,752 | $ 73,542 | $ 71,545 |
Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Dividend [Abstract] |  |  |  |  |  |  |  |  |  |
Common stock dividend (in dollars per share) |  |  |  |  |  |  | $ 1.32 | $ 1.28 | $ 1.24 |
Class B Common [Member] |  |  |  |  |  |  |  |  |  |
Dividend [Abstract] |  |  |  |  |  |  |  |  |  |
Common stock dividend (in dollars per share) |  |  |  |  |  |  | $ 1.32 | $ 1.28 | $ 1.24 |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Amended and Restated Credit Agreement [Abstract] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  | $ 1,100,000 |  |  |
Subsequent Event [Member] | Dividend Declared in Q1 2020 [Member] |  |  |  |  |  |  |  |  |  |
Dividend [Abstract] |  |  |  |  |  |  |  |  |  |
Cash dividends | $ 19,200 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Class A Common Stock [Member] | Dividend Declared in Q1 2020 [Member] |  |  |  |  |  |  |  |  |  |
Dividend [Abstract] |  |  |  |  |  |  |  |  |  |
Dividend declared date | Jun. 28, 2019 |  |  |  |  |  |  |  |  |
Common stock dividend (in dollars per share) | $ 0.34 |  |  |  |  |  |  |  |  |
Dividend payable date | Jul. 24, 2019 |  |  |  |  |  |  |  |  |
Dividend record date | Jul. 10, 2019 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Class B Common [Member] | Dividend Declared in Q1 2020 [Member] |  |  |  |  |  |  |  |  |  |
Dividend [Abstract] |  |  |  |  |  |  |  |  |  |
Dividend declared date | Jun. 28, 2019 |  |  |  |  |  |  |  |  |
Common stock dividend (in dollars per share) | $ 0.34 |  |  |  |  |  |  |  |  |
Dividend payable date | Jul. 24, 2019 |  |  |  |  |  |  |  |  |
Dividend record date | Jul. 10, 2019 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | zybooks [Member] |  |  |  |  |  |  |  |  |  |
Acquisition [Abstract] |  |  |  |  |  |  |  |  |  |
Cash to be paid to equity shareholders of acquiree company |  |  |  |  |  |  |  |  |  | $ 56,000
Subsequent Event [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Amended and Restated Credit Agreement [Abstract] |  |  |  |  |  |  |  |  |  |
Term of credit facility |  | 5 years |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 1,250,000 |  |  |  |  |  |  |  |
Subsequent Event [Member] | Term Loan A Facility [Member] |  |  |  |  |  |  |  |  |  |
Amended and Restated Credit Agreement [Abstract] |  |  |  |  |  |  |  |  |  |
Term of credit facility |  | 5 years |  |  |  |  |  |  |  |
Credit agreement face amount |  | $ 250,000 |  |  |  |  |  |  |  |
Credit agreement issuance cost |  | $ 4,000 |  |  |  |  |  |  |  |

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