Investments & Fair Value Measurements (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Apr. 01, 2022	Mar. 26, 2021	Sep. 24, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash Equivalents, at Carrying Value	$ 900,394
Cash and Cash Equivalents, Fair Value Disclosure			$ 1,225,380
Debt Securities, Available-for-sale, Amortized Cost	495,442		330,129
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1		0
Debt Securities, Available-for-sale	491,694		330,401
Investment Owned, Unrecognized Unrealized Depreciation	(3,765)		(52)
Cash Cash Equivalents And Investments Total	1,166,223		1,327,038
Financial assets carried at fair value	900,393		1,225,380
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0
Less Than 12 Months, Fair Value	257,678		40,984
Less Than 12 Months, Gross Unrealized Losses	(3,635)		(52)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	374,721		273,884
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	374,230		274,037
Available For Sale Securities Debt Maturities After One Through Two Years Amortized Cost	80,967		40,739
Available For Sale Securities Debt Maturities After One Through Two Years Fair Value	79,133		40,874
Available For Sale Securities Debt Maturities After Two Through Three Years Amortized Cost	39,754		15,506
Available For Sale Securities Debt Maturities After Two Through Three Years Fair Value	38,331		15,490
Investment Owned, at Cost	1,169,972		1,326,765
Investment Owned, Unrecognized Unrealized Appreciation	16		325
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	3,828
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	130
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	883,078		1,225,380
Financial assets carried at fair value	976,879		1,230,448
Derivative Asset			0
Derivative Liability			0
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	17,315		0
Financial assets carried at fair value	181,116		90,134
Derivative Asset			689
Derivative Liability			(197)
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0
Financial assets carried at fair value	0
Derivative Asset			0
Derivative Liability			0
Cash [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash Equivalents, at Carrying Value	665,624
Cash and Cash Equivalents, Fair Value Disclosure	665,624		990,182
Cash [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	665,624		990,182
Cash [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0
Cash [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0
Commercial Paper [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	7,407
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0
Debt Securities, Available-for-sale	7,407
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0
Commercial Paper [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0
Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure			235,198
Debt Securities, Available-for-sale, Amortized Cost	207,458
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0
Debt Securities, Available-for-sale	207,458
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0
Money Market Funds [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	207,458		235,198
Money Market Funds [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0
Government Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash Equivalents, at Carrying Value	9,996
Cash and Cash Equivalents, Fair Value Disclosure	9,996
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0
Government Bonds [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	9,996
Certificates of Deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash Equivalents, at Carrying Value	2,899
Cash and Cash Equivalents, Fair Value Disclosure	2,899
Certificates of Deposit [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	2,899
Municipal Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	7,010
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1
Debt Securities, Available-for-sale	7,009
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0
Municipal Notes | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0
Municipal Notes | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	7,009
Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure			235,198
Certificates of Deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Less Than 12 Months, Fair Value	8,213		600
Less Than 12 Months, Gross Unrealized Losses	(23)		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
U.S. Agency Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Less Than 12 Months, Fair Value	872		1,449
Less Than 12 Months, Gross Unrealized Losses	(24)		(2)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	537
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	19
U.S. Agency Securities [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure			0
US Government Agencies Short-term Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0
Debt Securities, Available-for-sale	813		1,102
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1
US Government Agencies Short-term Debt Securities [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	0
US Government Agencies Short-term Debt Securities [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	813
US Government Agencies Short-term Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	0
Government Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Less Than 12 Months, Fair Value	106,409		8,940
Less Than 12 Months, Gross Unrealized Losses	(1,788)		(16)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,743
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	93
Commercial Paper [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Less Than 12 Months, Fair Value	22,139		0
Less Than 12 Months, Gross Unrealized Losses	(36)		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Commercial Paper [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	7,407
Corporate Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Less Than 12 Months, Fair Value	80,242		22,964
Less Than 12 Months, Gross Unrealized Losses	(1,337)		(25)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	548
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	18
Municipal Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Less Than 12 Months, Fair Value	39,803		7,031
Less Than 12 Months, Gross Unrealized Losses	(427)		(9)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Short-term Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax			155
Investments Held In Supplemental Retirement Plan [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets carried at fair value	4,623		4,975
Financial liabilities carried at fair value	4,623		4,975
Investments Held In Supplemental Retirement Plan [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets carried at fair value	0
Financial liabilities carried at fair value	0
Investments Held In Supplemental Retirement Plan [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets carried at fair value	0
Financial liabilities carried at fair value	0
Short-term Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Amortized Cost			38,685
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax			1
Debt Securities, Available-for-sale			38,839
Short-term Investments [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	43,904		102
Short-term Investments [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	97,784		38,737
Short-term Investments [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	0
Short-term Investments [Member] | Certificates of Deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	8,685		1,795
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	23		0
Debt Securities, Available-for-sale	8,663		1,795
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1		0
Short-term Investments [Member] | Certificates of Deposit [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	0
Short-term Investments [Member] | Certificates of Deposit [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	8,663		1,795
Short-term Investments [Member] | Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	0
Short-term Investments [Member] | U.S. Agency Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Amortized Cost			1,096
Short-term Investments [Member] | US Government Agencies Short-term Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	812
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax			0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax			6
Short-term Investments [Member] | US Government Agencies Short-term Debt Securities [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure			1,102
Short-term Investments [Member] | Government Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	46,761		100
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	202		0
Debt Securities, Available-for-sale	46,560		102
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1		2
Short-term Investments [Member] | Government Bonds [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	43,904		102
Short-term Investments [Member] | Government Bonds [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	2,656		0
Short-term Investments [Member] | Government Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	0
Short-term Investments [Member] | Commercial Paper [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	20,189		5,184
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	36		0
Debt Securities, Available-for-sale	20,153		5,186
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0		2
Short-term Investments [Member] | Commercial Paper [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	0
Short-term Investments [Member] | Commercial Paper [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	20,153		5,186
Short-term Investments [Member] | Commercial Paper [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	0
Short-term Investments [Member] | Corporate Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	44,824		18,850
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	206		0
Debt Securities, Available-for-sale	44,626		18,966
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	8		116
Short-term Investments [Member] | Corporate Debt Securities [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	0
Short-term Investments [Member] | Corporate Debt Securities [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	44,626		18,966
Short-term Investments [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	0
Short-term Investments [Member] | Municipal Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	20,919		11,660
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	49		1
Debt Securities, Available-for-sale	20,873		11,688
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	3		29
Short-term Investments [Member] | Municipal Bonds [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	0
Short-term Investments [Member] | Municipal Bonds [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	20,873		11,688
Short-term Investments [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	0
Short-term Investments [Member] | Short-term Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	142,190
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	516
Debt Securities, Available-for-sale	141,688
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	14
Long-term Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Amortized Cost			62,700
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax			51
Debt Securities, Available-for-sale			62,819
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax			170
Long-term Investments [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	49,897		4,966
Long-term Investments [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	66,017		51,397
Long-term Investments [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	0
Long-term Investments [Member] | U.S. Agency Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,450		2,264
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	43		2
Debt Securities, Available-for-sale	1,407		2,275
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0		13
Long-term Investments [Member] | U.S. Agency Securities [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	0
Long-term Investments [Member] | U.S. Agency Securities [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	1,407		2,275
Long-term Investments [Member] | U.S. Agency Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	0
Long-term Investments [Member] | Government Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	55,544		11,784
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1,679		16
Debt Securities, Available-for-sale	53,865		11,806
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0		38
Long-term Investments [Member] | Government Bonds [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	49,897		4,966
Long-term Investments [Member] | Government Bonds [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	3,968		6,840
Long-term Investments [Member] | Government Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	0
Long-term Investments [Member] | Corporate Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	43,704		32,116
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1,149		25
Debt Securities, Available-for-sale	42,557		32,152
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	2		61
Long-term Investments [Member] | Corporate Debt Securities [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	0
Long-term Investments [Member] | Corporate Debt Securities [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	42,557		32,152
Long-term Investments [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	0
Long-term Investments [Member] | Municipal Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	18,462		10,080
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	377		8
Debt Securities, Available-for-sale	18,085		10,130
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0		58
Long-term Investments [Member] | Municipal Bonds [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	0
Long-term Investments [Member] | Municipal Bonds [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	18,085		10,130
Long-term Investments [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	0
Long-term Investments [Member] | Other Long-term Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	8,228		6,456
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0		0
Debt Securities, Available-for-sale	8,228		6,456
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0		0
Net Investment Income		$ 1,900
Long-term Investments [Member] | Other Long-term Investments [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	0		0
Long-term Investments [Member] | Other Long-term Investments [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	0
Long-term Investments [Member] | Other Long-term Investments [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	0
Long-term Investments [Member] | Long-term Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	127,388
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	3,248
Debt Securities, Available-for-sale	124,142
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	2
Other Current Assets [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	0
Other Current Assets [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	486
Other Current Assets [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	0
Other Accrued Liabilities | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Liability	0
Other Accrued Liabilities | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Liability	(324)
Other Accrued Liabilities | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Liability	0
Derivative Financial Instruments, Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Financial Instruments, Assets, Amortized Cost Basis			0
Derivative Financial Instruments, Unrealized Gain			689
Derivative Financial Instruments, Unrealized Loss			0
Derivative Asset			689
Derivative Financial Instruments, Assets [Member] | Other Current Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Financial Instruments, Assets, Amortized Cost Basis	0
Derivative Financial Instruments, Unrealized Gain	486
Derivative Financial Instruments, Unrealized Loss	0
Derivative Asset	486
Derivative Financial Instruments, Liabilities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Financial Instruments, Unrealized Gain			0
Derivative Financial Instruments, Unrealized Loss			(197)
Derivative Financial Instruments, Liabilities, Amortized Cost Basis			0
Derivative Liability			$ (197)
Derivative Financial Instruments, Liabilities [Member] | Other Accrued Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Financial Instruments, Unrealized Gain	0
Derivative Financial Instruments, Unrealized Loss	(324)
Derivative Financial Instruments, Liabilities, Amortized Cost Basis	0
Derivative Liability	$ (324)