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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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