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Investments & Fair Value Measurements (Tables) | 6 Months Ended
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Mar. 27, 2015
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |
Schedule Of Financial Assets and Liabilities Carried At Fair Value | The following table summarizes unrealized gains and losses on our cash and investment portfolio and our financial assets and liabilities measured at fair value on a recurring basis (in thousands):
| March 27, 2015
| Cost | Unrealized |  |  | Estimated Fair Value
| Gains | Losses | Total |  | Level 1 | Level 2 | Level 3
Cash and cash equivalents: |  |  |  |  |  |  |  |
Cash | $ | 498,556 |  |  |  | $ | 498,556 |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |
Money market funds | 15,438 |  | — |  | — |  | 15,438 |  |  | 15,438 |  |  |
Cash and cash equivalents | 513,994 |  | — |  | — |  | 513,994 |  |  | 15,438 |  | — |  | — |
Short-term investments: |  |  |  |  |  |  |  |
Government bonds | 1,999 |  | 7 |  | — |  | 2,006 |  |  | 2,006 |  |  |
Commercial paper | 3,999 |  | — |  | — |  | 3,999 |  |  |  | 3,999 |  |
Corporate bonds | 79,485 |  | 86 |  | (15 | ) | 79,556 |  |  |  | 79,556 |  |
Municipal debt securities | 102,480 |  | 129 |  | (6 | ) | 102,603 |  |  |  | 102,603 |  |
Short-term investments | 187,963 |  | 222 |  | (21 | ) | 188,164 |  |  | 2,006 |  | 186,158 |  | — |
Long-term investments: |  |  |  |  |  |  |  |
U.S. agency securities | 5,000 |  | 6 |  | — |  | 5,006 |  |  | 5,006 |  |  |
Government bonds | 20,290 |  | 4 |  | (33 | ) | 20,261 |  |  | 20,261 |  |  |
Corporate bonds | 144,666 |  | 376 |  | (22 | ) | 145,020 |  |  |  | 145,020 |  |
Municipal debt securities | 158,079 |  | 236 |  | (54 | ) | 158,261 |  |  |  | 158,261 |  |
Other long-term investments (1) | 1,750 |  | — |  | — |  | 1,750 |  |  | 1,050 |  |  | 700 |
Long-term investments | 329,785 |  | 622 |  | (109 | ) | 330,298 |  |  | 26,317 |  | 303,281 |  | 700 |
Total cash, cash equivalents, and investments | $ | 1,031,742 |  | $ | 844 |  | $ | (130 | ) | $ | 1,032,456 |  |  | $ | 43,761 |  | $ | 489,439 |  | $ | 700 |
Investments held in supplemental retirement plan: |  |  |  |  |  |  |  |
Assets | 2,560 |  | — |  | — |  | 2,560 |  |  | 2,560 |  |  |
Included in prepaid expenses and other current assets & other non-current assets |  |  |  |  |
Liabilities | 2,560 |  | — |  | — |  | 2,560 |  |  | 2,560 |  |  |
Included in accrued liabilities & other non-current liabilities |  |  |  |  |
Contingent consideration related to acquisition: |  |  |  |  |  |  |  |
Liabilities | 740 |  | — |  | — |  | 740 |  |  |  |  |  | 740 |
Included in accrued liabilities |  |  |  |  |
(1) | Other long-term investments as of March 27, 2015 include a marketable equity security of $1.1 million and cost method investments of $0.7 million.
| September 26, 2014
| Cost | Unrealized |  |  | Estimated Fair Value
| Gains | Losses | Total |  | Level 1 | Level 2 | Level 3
Cash and cash equivalents: |  |  |  |  |  |  |  |
Cash | $ | 564,745 |  |  |  |  |  | $ | 564,745 |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |
Money market funds | 1,727 |  | — |  | — |  | 1,727 |  |  | 1,727 |  |  |  |  |
Commercial paper | 2,000 |  | — |  | — |  | 2,000 |  |  |  |  | 2,000 |  |  |
Cash and cash equivalents | 568,472 |  | — |  | — |  | 568,472 |  |  | 1,727 |  | 2,000 |  | — |
Short-term investments: |  |  |  |  |  |  |  |
U.S. agency securities | 35,443 |  | 5 |  | (3 | ) | 35,445 |  |  | 35,445 |  |  |  |  |
Commercial paper | 21,788 |  | — |  | — |  | 21,788 |  |  |  |  | 21,788 |  |  |
Corporate bonds | 56,106 |  | 81 |  | (10 | ) | 56,177 |  |  |  |  | 56,177 |  |  |
Municipal debt securities | 117,606 |  | 197 |  | (5 | ) | 117,798 |  |  |  |  | 117,798 |  |  |
Short-term investments | 230,943 |  | 283 |  | (18 | ) | 231,208 |  |  | 35,445 |  | 195,763 |  | — |
Long-term investments: |  |  |  |  |  |  |  |
U.S. agency securities | 31,980 |  | 19 |  | (6 | ) | 31,993 |  |  | 31,993 |  |  |  |  |
Corporate bonds | 117,063 |  | 226 |  | (80 | ) | 117,209 |  |  |  |  | 117,209 |  |  |
Municipal debt securities | 146,337 |  | 326 |  | (30 | ) | 146,633 |  |  |  |  | 146,633 |  |  |
Other long-term investments (1) | 500 |  | — |  | — |  | 500 |  |  |  |  |  |  |  |
Long-term investments | 295,880 |  | 571 |  | (116 | ) | 296,335 |  |  | 31,993 |  | 263,842 |  | — |
Total cash, cash equivalents, and investments | $ | 1,095,295 |  | $ | 854 |  | $ | (134 | ) | $ | 1,096,015 |  |  | $ | 69,165 |  | $ | 461,605 |  | $ | — |
Investments held in supplemental retirement plan: |  |  |  |  |  |  |  |
Assets | 2,507 |  | — |  | — |  | 2,507 |  |  | 2,507 |  |  |  |  |
Included in prepaid expenses and other current assets & other non-current assets |  |  |  |  |
Liabilities | 2,507 |  | — |  | — |  | 2,507 |  |  | 2,507 |  |  |  |  |
Included in accrued liabilities & other non-current liabilities |  |  |  |  |
(1) | Other long-term investments as of September 26, 2014 include a cost method investment of $0.5 million.
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | The following table presents the gross unrealized losses and fair value for those available-for-sale securities that were in an unrealized loss position as of March 27, 2015 and September 26, 2014 (in thousands):
| March 27, 2015 |  | September 26, 2014
Investment Type | Fair Value | Gross Unrealized Losses (1) |  | Fair Value | Gross Unrealized Losses (1)
U.S. agency securities | $ | 17,758 |  | $ | (33 | ) |  | $ | 31,930 |  | $ | (9 | )
Corporate bonds | 64,387 |  | (37 | ) |  | 78,166 |  | (90 | )
Municipal debt securities | 47,479 |  | (60 | ) |  | 55,979 |  | (35 | )
Total | $ | 129,624 |  | $ | (130 | ) |  | $ | 166,075 |  | $ | (134 | )
(1) | Our available-for-sale securities in an unrealized loss position were in such position for less than twelve months as of both March 27, 2015 and September 26, 2014.
Available-for-sale Securities | The following table summarizes the amortized cost and estimated fair value of the available-for-sale securities within our investment portfolio based on stated maturities as of March 27, 2015 and September 26, 2014, which are recorded within cash equivalents and both short and long-term investments in our consolidated balance sheets (in thousands):
| March 27, 2015 |  | September 26, 2014
Range of maturity | Amortized Cost | Fair Value |  | Amortized Cost | Fair Value
Due within 1 year | $ | 187,963 |  | $ | 188,164 |  |  | $ | 232,944 |  | $ | 233,208 |
Due in 1 to 2 years | 207,097 |  | 207,445 |  |  | 179,177 |  | 179,536 |
Due in 2 to 3 years | 120,938 |  | 121,103 |  |  | 116,204 |  | 116,299 |
Total | $ | 515,998 |  | $ | 516,712 |  |  | $ | 528,325 |  | $ | 529,043 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
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