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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Mar. 31, 2020 | Mar. 31, 2019 | Jun. 30, 2019 | Apr. 30, 1997
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common shares repurchased under repurchase program |  | 41,800,000 | 200,000 |  |
Cost of common shares repurchased | $ 22,845 | $ 1,600,000 | $ 22,800 |  |
Total number of shares repurchased pursuant to the repurchase program |  | 41,836,234 |  | 41,836,234 |
Total cost of shares repurchased pursuant to the repurchase program |  | $ 1,623,256 |  | $ 1,623,256 |
Additional shares that can be repurchased under the approved share repurchase program |  | 12,900,000 |  |  |
Preferred stock, shares authorized |  | 2,000,000 |  | 2,000,000 |
Preferred stock at par value |  | $ 0.01 |  | $ 0.01 |
Preferred stock, shares issued |  | 0 |  | 0 |
Shares issued under Employee Stock Purchase Plan |  | 137,000 | 129,000 |  |
Treasury Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common shares repurchased under repurchase program | 200,000 |  |  |  |
Cost of common shares repurchased | $ 22,844 |  |  |  |
Series A Junior Participating Preferred Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  | 2,000,000.0
Preferred stock at par value |  |  |  |  | $ 0.01
Preferred stock, shares issued |  | 0 |  | 0 |
Preferred stock, shares outstanding |  | 0 |  | 0 |
2009 Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expiration period |  | 7 years |  |  |
Common stock authorized for issuance |  | 51,100,000 |  |  |
Number of securities remaining available for future issuance |  | 15,800,000 |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of securities remaining available for future issuance |  | 2,100,000 |  |  |
Minimum [Member] | 2009 Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 1 year |  |  |
Maximum [Member] | 2009 Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 4 years |  |  |

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