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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Nov. 30, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Jun. 30, 2017 | Apr. 30, 1997
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common shares repurchased under repurchase program |  |  | 300,000 |  |  |
Cost of common shares repurchased |  |  | $ 27,900 |  |  |
Total number of shares repurchased pursuant to the repurchase program |  |  | 41,386,234 |  | 41,086,234 |
Total cost of shares repurchased pursuant to the repurchase program |  |  | $ 1,574,508 |  | $ 1,546,611 |
Additional shares that can be repurchased under the approved share repurchase program |  |  | 13,300,000 |  |  |
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 |
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
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 |  |  |
Maximum amount payable pursant to cash denominated performance awards granted | $ 5,000 | $ 3,000 |  |  |  |
Vesting period |  | 4 years |  |  |  |
Expiration date |  | Sep. 11, 2027 |  |  |  |
Common stock authorized for issuance |  |  | 51,100,000 |  |  |
Common stock authorized for issuance and pending registration |  | 7,400,000 |  |  |  |
Number of securities remaining available for future issuance |  |  | 17,900,000 |  |  |
2009 Plan [Member] | Non Employee Director [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum award amount with other cash fees earned for services |  | $ 700 |  |  |  |
2009 Plan [Member] | Board Of Directors Chairman [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum award amount with other cash fees earned for services |  | $ 1,200 |  |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of securities remaining available for future issuance |  |  | 700,000 |  |  |
Shares issued under Employee Stock Purchase Plan |  |  | 148,000 | 142,000 |  |
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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