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Stockholders' Equity And Stock-Based Compensation (Narrative) (Details) |  |  |  |  | 1 Months Ended | 9 Months Ended | 41 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 15, 2022 | Dec. 15, 2021 | Dec. 15, 2020 | Dec. 16, 2019 shares | Dec. 30, 2022 | Jun. 30, 2023 USD ($) vote shares | Mar. 28, 2014 | Sep. 30, 2022 shares
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Shares, Granted (in shares) |  |  |  |  |  | 1,617,000 |  |
Vested in period (in shares) |  |  |  |  |  | 1,165,000 |  |
Options outstanding to purchase |  |  |  |  |  |  |  | 4,059,000
Remaining authorization to purchase additional shares | $ |  |  |  |  |  | $ 236,600,000 |  |
Stock options |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Stock options expected to vest | $ |  |  |  |  |  | $ 13,200,000 |  |
Employee stock options expected to be recognized over a weighted-average period |  |  |  |  |  | 2 years 6 months |  |
Performance-Based Stock Options [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  | 7 years |  |
Compensation requisite measurement period |  |  |  |  |  | 3 years |  |
Shares exercisable (in shares) |  |  |  |  |  | 270,228 |  |
Restricted stock units |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  | 4 years |  |
Stock options expected to vest | $ |  |  |  |  |  | $ 201,700,000 |  |
Employee stock options expected to be recognized over a weighted-average period |  |  |  |  |  | 2 years 6 months |  |
Restricted stock units | Employees and Officers [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  | 4 years |  |
Restricted stock units | Awards Granted Prior to November 2010 [Member] | Directors [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  | 1 year |
Performance-Based Restricted Stock Units |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Compensation requisite measurement period |  |  |  |  |  | 3 years |  |
Performance-Based Restricted Stock Units | Executive Officer |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Percentage Vested of Target Award | 200.00% | 200.00% | 200.00% |  |  | 200.00% |  |
Options outstanding to purchase |  |  |  |  |  | 204,709 |  |
Performance-Based Restricted Stock Units | Vesting Shares At 200% Of The Target Award Amount | Executive Officer |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Options outstanding to purchase |  |  |  |  |  | 409,418 |  |
Performance Shares | Executive Officer |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Shares, Granted (in shares) |  |  |  | 62,000 |  |  |  |
Award vesting rights, percentage |  |  |  |  | 81.00% |  |  |
Awards Granted Under 2005 Stock Plan From February 2011 [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Terms for issuance of stock (in shares) |  |  |  |  |  | 1.6 |  |
Employee stock purchase plan |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Percentage of compensation withheld by employees to purchase common stock |  |  |  |  |  | 10.00% |  |
Discount from market price on purchase date |  |  |  |  |  | 15.00% |  |
Class A Common Stock [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized (shares) |  |  |  |  |  | 500,000,000 |  | 500,000,000
Common stock, shares issued (shares) |  |  |  |  |  | 59,702,582 |  | 59,798,862
Common stock, shares outstanding (shares) |  |  |  |  |  | 59,702,582 |  | 59,798,862
Common stock, number of votes per share | vote |  |  |  |  |  | 1 |  |
Class A Common Stock [Member] | 2005 Stock Plan. [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Shares authorized under plan |  |  |  |  |  | 64,000,000 |  |
Options outstanding to purchase |  |  |  |  |  | 3,928,000 |  |
Class A Common Stock [Member] | Employee stock purchase plan |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Maximum value of common stock available for eligible employees | $ |  |  |  |  |  | $ 25,000 |  |
Maximum number of common stock available for eligible employees (in shares) |  |  |  |  |  | 1,000 |  |
Purchase period |  |  |  |  |  | 6 months |  |
Look back commencement period |  |  |  |  |  | 1 year |  |
Class B Common Stock [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized (shares) |  |  |  |  |  | 500,000,000 |  | 500,000,000
Common stock, shares issued (shares) |  |  |  |  |  | 36,085,779 |  | 36,085,779
Common stock, shares outstanding (shares) |  |  |  |  |  | 36,085,779 |  | 36,085,779
Common stock, number of votes per share | vote |  |  |  |  |  | 10 |  |
Options Granted From June Two Thousand Eight Member | Stock options |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  | 4 years |  |
Options Granted From June Two Thousand Eight Member | Stock options | One year anniversary date |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  | 1 year |  |
Percentage of stock option becoming exercisable subjected to date of grant |  |  |  |  |  | 25.00% |  |
Options Granted From June Two Thousand Eight Member | Stock options | Over 36 equally installment periods following one year anniversary date |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  | 36 months |  |
Awards Granted After November 2010 Member [Member] | Restricted stock units |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  | 1 year |  |
Minimum [Member] | Performance-Based Stock Options [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Percentage Vested of Target Award |  |  |  |  |  | 0.00% |  |
Minimum [Member] | Performance-Based Restricted Stock Units |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Percentage Vested of Target Award |  |  |  |  |  | 0.00% |  |
Minimum [Member] | Options Granted From June Two Thousand Eight Member | Stock options |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Options expiration period |  |  |  |  |  | 3 months |  |
Maximum [Member] | Performance-Based Stock Options [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Percentage Vested of Target Award |  |  |  |  |  | 125.00% |  |
Maximum [Member] | Performance-Based Restricted Stock Units |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Percentage Vested of Target Award |  |  |  |  |  | 200.00% |  |
Maximum [Member] | Options Granted From June Two Thousand Eight Member | Stock options |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Options expiration period |  |  |  |  |  | 10 years |  |

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