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Stockholders' Equity And Stock-Based Compensation (Summary Of Stock Options Issued To Officers, Directors, And Employees Under 2000 Stock Incentive Plan And 2005 Stock Plan) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 6 Months Ended
--- | --- | ---
Dec. 15, 2018 | Mar. 31, 2023
Shares |  |
Shares, Options outstanding at beginning of period (in shares) |  | 4,059,000
Shares, Grants (in shares) |  | 326,000
Shares, Exercises (in shares) |  | (325,000)
Shares, Options vested and expected to vest (in shares) |  | 3,896,000
Weighted-Average Exercise Price |  |
Weighted Average Exercise Price, Options outstanding at beginning of period (in usd per share) |  | $ 62.59
Weighted Average Exercise Price, Grants (in usd per share) |  | 71.07
Weighted Average Exercise Price, Exercises (in usd per share) |  | 42.52
Weighted Average Exercise Price, Options outstanding at end of period (in usd per share) |  | 64.92
Weighted Average Exercise Price, Options vested and expected to vest (in usd per share) |  | 64.64
Weighted Average Exercise Price, Options exercisable (in usd per share) |  | $ 60.74
Weighted Average Remaining Contractual Life, Options vested and expected to vest at end of period |  | 5 years 6 months 7 days
Weighted Average Remaining Contractual Life, Options exercisable |  | 4 years 8 months 15 days
Aggregate Intrinsic Value, Options outstanding |  | $ 86,066
Aggregate Intrinsic Value, Options vested and expected to vest |  | 85,167
Aggregate Intrinsic Value, Options exercisable |  | $ 77,350
Year End Stock Price (in dollars per share) |  | $ 85.42
2005 Stock Plan. [Member] | Class A Common Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options vested and exercisable (in shares) |  | 3,059,000
Weighted average remaining contractual life |  | 5 years 7 months 9 days
Shares |  |
Shares, Options outstanding at end of period (in shares) |  | 4,060,000
Weighted-Average Exercise Price |  |
Weighted Average Remaining Contractual Life, Options outstanding |  | 5 years 7 months 9 days
Performance-Based Stock Options [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares exercisable (in shares) |  | 315,839
Performance-Based Stock Options [Member] | Executive Officer [Member] | December 15, 2018 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Aggregate Shares Granted at Target Award (in shares) | 241,100 |
Shares exercisable (in shares) | 158,700 |
Percentage Vested of Target Award | 75.00% |

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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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