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Share Repurchase Program (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 118 Months Ended
--- | --- | --- | --- | --- | --- | ---
Oct. 28, 2020 | Feb. 05, 2020 | Nov. 06, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Nov. 06, 2020
Share Repurchase Program |  |  |  |  |  |  |  |
Increase in authorized amount |  | $ 1,000,000 |  |  |  |  |  |
Authorization effective period |  | 3 years |  |  |  |  |  |
Remaining balance under share repurchase program |  |  |  | $ 474,700 |  | $ 474,700 |  |
Common stock repurchased, shares |  |  |  | 965 | 1,025 | 2,634 | 3,585 |
Common stock repurchased, average price per share |  |  |  | $ 458.70 | $ 377.85 | $ 415.28 | $ 364.84 |
Common stock repurchased, value |  |  |  | $ 442,962 | $ 387,255 | $ 1,093,973 | $ 1,307,947 |
Subsequent event [Member] |  |  |  |  |  |  |  |
Share Repurchase Program |  |  |  |  |  |  |  |
Increase in authorized amount | $ 1,000,000 |  |  |  |  |  |  |
Cumulative authorized amount | $ 14,800,000 |  |  |  |  |  |  |
Authorization effective period | 3 years |  |  |  |  |  |  |
Common stock repurchased, shares |  |  | 1,000 |  |  |  |  | 79,800
Common stock repurchased, average price per share |  |  | $ 454.15 |  |  |  |  | $ 172.09
Common stock repurchased, value |  |  | $ 465,300 |  |  |  |  | $ 13,700,000

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- Definition Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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