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Fair Value Of Financial Instruments (Narrative) (Details) - USD ($) shares in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 23, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Sep. 30, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value of investments in rabbi trust |  | $ 20,803,000 |  | $ 19,330,000 |
Asset impairments |  | 731,000 | $ 2,709,000 |  |
Long-term investments |  | 333,088,000 |  | 274,311,000 |
Other assets |  | 58,283,000 |  | 56,716,000 |
US Treasury Securities [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Investments |  | 539,499,000 |  | 501,288,000 |
Investments maturing within one year |  | 240,379,000 |  | 260,945,000 |
Fair value held-to-maturity investments |  | 532,510,000 |  | 500,172,000 |
Corporate Debt Securities [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value held-to-maturity investments |  | 17,500,000 |  |  | $ 18,000,000
Promissory note |  | 18,000,000 |  |  |
Reserve for expected credit losses |  | $ 216,000 |  |  |
Supplier [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Ownership percentage |  | 12.70% |  |  |
Cash consideration |  | $ 10,000,000 |  |  |
Other assets |  | 8,915,000 |  | $ 9,251,000 |
Equity method investment, impairment |  | 0 | $ 0 |  |
Nuro [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Shares acquired | 766 |  |  |  |
Cash consideration | $ 10,000,000 |  |  |  |
Long-term investments |  | $ 15,968,000 |  |  |
Maximum [Member] | US Treasury Securities [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Investment maturity term |  | 27 months |  | 24 months |

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