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Fair Value Measurements (Schedule Of Financial Assets Carried At Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified
|
Mar. 30, 2012
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Sep. 30, 2011
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
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| Financial assets carried at fair value |
$ 827,042 |
|
$ 823,007 |
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|
Level 1 [Member]
|
|
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
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| Financial assets carried at fair value |
291,595 |
|
173,848 |
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|
Level 2 [Member]
|
|
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
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| Financial assets carried at fair value |
535,447 |
|
649,159 |
|
|
Level 3 [Member]
|
|
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
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| Financial assets carried at fair value |
|
|
|
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Corporate Bonds [Member]
|
|
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
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| Financial assets carried at fair value |
125,092 |
[1] |
176,958 |
[1] |
|
Corporate Bonds [Member] | Level 1 [Member]
|
|
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Financial assets carried at fair value |
|
[1] |
|
[1] |
|
Corporate Bonds [Member] | Level 2 [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Financial assets carried at fair value |
125,092 |
[1] |
176,958 |
[1] |
|
Corporate Bonds [Member] | Level 3 [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Financial assets carried at fair value |
|
[1] |
|
[1] |
|
Municipal debt securities [Member]
|
|
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
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| Financial assets carried at fair value |
389,371 |
[1] |
472,201 |
[1] |
|
Municipal debt securities [Member] | Level 1 [Member]
|
|
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
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| Financial assets carried at fair value |
|
[1] |
|
[1] |
|
Municipal debt securities [Member] | Level 2 [Member]
|
|
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Financial assets carried at fair value |
389,371 |
[1] |
472,201 |
[1] |
|
Municipal debt securities [Member] | Level 3 [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Financial assets carried at fair value |
|
[1] |
|
[1] |
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U.S. Agency Securities [Member]
|
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
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| Financial assets carried at fair value |
25,092 |
[1],[2] |
29,919 |
[1],[2] |
|
U.S. Agency Securities [Member] | Level 1 [Member]
|
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Financial assets carried at fair value |
25,092 |
[1],[2] |
29,919 |
[1],[2] |
|
U.S. Agency Securities [Member] | Level 2 [Member]
|
|
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
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| Financial assets carried at fair value |
|
[1],[2] |
|
[1],[2] |
|
U.S. Agency Securities [Member] | Level 3 [Member]
|
|
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
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| Financial assets carried at fair value |
|
[1],[2] |
|
[1],[2] |
|
Money Market Funds [Member]
|
|
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
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| Financial assets carried at fair value |
264,366 |
[2] |
142,038 |
[2] |
|
Money Market Funds [Member] | Level 1 [Member]
|
|
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
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| Financial assets carried at fair value |
264,366 |
[2] |
142,038 |
[2] |
|
Money Market Funds [Member] | Level 2 [Member]
|
|
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Financial assets carried at fair value |
|
[2] |
|
[2] |
|
Money Market Funds [Member] | Level 3 [Member]
|
|
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
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| Financial assets carried at fair value |
|
[2] |
|
[2] |
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Commercial Paper [Member]
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|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
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| Financial assets carried at fair value |
20,984 |
[3] |
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Commercial Paper [Member] | Level 1 [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
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| Financial assets carried at fair value |
|
[3] |
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Commercial Paper [Member] | Level 2 [Member]
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|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
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| Financial assets carried at fair value |
20,984 |
[3] |
|
|
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Commercial Paper [Member] | Level 3 [Member]
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|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
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| Financial assets carried at fair value |
|
[3] |
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Investments Held In Supplemental Retirement Plan [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
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| Financial assets carried at fair value |
2,137 |
[4] |
1,891 |
[4] |
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Investments Held In Supplemental Retirement Plan [Member] | Level 1 [Member]
|
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Financial assets carried at fair value |
2,137 |
[4] |
1,891 |
[4] |
|
Investments Held In Supplemental Retirement Plan [Member] | Level 2 [Member]
|
|
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
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| Financial assets carried at fair value |
|
[4] |
|
[4] |
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Investments Held In Supplemental Retirement Plan [Member] | Level 3 [Member]
|
|
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Financial assets carried at fair value |
|
[4] |
|
[4] |
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