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CASH, CASH EQUIVALENTS, RESTRICTED CASH AND SHORT-TERM INVESTMENTS (Details) - USD ($) $ in Thousands | Jun. 29, 2019 | Sep. 29, 2018 | Jun. 30, 2018 | Sep. 30, 2017
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Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items] |  |  |  |  |  |  |
Cash |  | $ 261,806 |  | $ 42,446 |  |  |
Cash and Cash Equivalents, Amortized Cost |  | 395,538 |  | 320,635 |  |  |
Cash and Cash Equivalents, Unrealized Gain |  | 0 |  | 0 |  |  |
Cash and Cash Equivalents, Unrealized Loss |  | 0 |  | (5) |  |  |
Cash and Cash Equivalents, Estimated Fair Value |  | 395,538 |  | 320,630 |  |  |
Restricted Cash |  | 474 | [1] | 518 | [2] |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Amortized Cost |  | 396,012 |  | 321,153 |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  | 396,012 |  | 321,148 |  | $ 363,200 | $ 392,940
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Unrealized Gain |  | 0 |  | 0 |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Unrealized Loss |  | 0 |  | (5) |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Estimated Fair Value |  | 396,012 |  | 321,148 |  |  |
Short-term Investments, Unrealized Gain |  | 0 |  | 0 |  |  |
Short-term Investments, Unrealized Loss |  | 0 |  | 0 |  |  |
Short-term Investments, Estimated Fair Value |  | 248,000 |  | 293,000 |  |  |
Short-term investments | [3] | 248,000 |  | 293,000 |  |  |
Cash, Cash Equivalents, Restricted Cash, Restricted Cash Equivalents, and Short-Term Investments, Amortized Cost |  | 644,012 |  | 614,153 |  |  |
Cash, Cash Equivalents, Restricted Cash, Restricted Cash Equivalents, and Short-Term Investments, Unrealized Gain |  | 0 |  | 0 |  |  |
Cash, Cash Equivalents, Restricted Cash, Restricted Cash Equivalents, and Short-Term Investments, Unrealized Loss |  | 0 |  | (5) |  |  |
Cash, Cash Equivalents, Restricted Cash, Restricted Cash Equivalents, and Short-Term Investments, Estimated Fair Value |  | 644,012 |  | 614,148 |  |  |
Money market funds |  |  |  |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items] |  |  |  |  |  |  |
Cash Equivalents, Amortized Cost |  | 123,726 |  | 209,172 |  |  |
Cash Equivalents, Unrealized Gain |  | 0 |  | 0 |  |  |
Cash Equivalents, Unrealized Loss |  | 0 |  | (5) |  |  |
Cash Equivalents, Estimated Fair Value |  | 123,726 | [4] | 209,167 | [5] |  |
Time deposits |  |  |  |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items] |  |  |  |  |  |  |
Cash Equivalents, Amortized Cost |  | 10,006 |  | 69,017 |  |  |
Cash Equivalents, Unrealized Gain |  | 0 |  | 0 |  |  |
Cash Equivalents, Unrealized Loss |  | 0 |  | 0 |  |  |
Cash Equivalents, Estimated Fair Value |  | 10,006 | [1] | 69,017 | [2] |  |
Short-term Investments, Unrealized Gain |  | 0 |  | 0 |  |  |
Short-term Investments, Unrealized Loss |  | 0 |  | 0 |  |  |
Short-term Investments, Estimated Fair Value |  | 149,000 | [1] | 197,000 | [5] |  |
Short-term investments |  | 149,000 |  | 197,000 |  |  |
Deposits |  |  |  |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items] |  |  |  |  |  |  |
Short-term Investments, Unrealized Gain |  | 0 |  | 0 |  |  |
Short-term Investments, Unrealized Loss |  | 0 |  | 0 |  |  |
Short-term Investments, Estimated Fair Value |  | 99,000 | [1],[6] | 96,000 | [2],[7] |  |
Short-term investments |  | $ 99,000 | [6] | $ 96,000 | [7] |  |
[1] | Fair value approximates cost basis.
[2] | Fair value approximates cost basis.
[3] | All short-term investments were classified as available-for-sale and were measured at fair value based on level one measurement, or quoted market prices, as defined by ASC 820. The Company did not recognize any realized gains or losses on the sale of investments during the three and nine months ended June 29, 2019 and June 30, 2018.
[4] | The fair value was determined using unadjusted prices in active, accessible markets for identical assets, and as such they were classified as Level 1 assets in the fair value hierarchy.
[5] | The fair value was determined using unadjusted prices in active, accessible markets for identical assets, and as such they were classified as Level 1 assets in the fair value hierarchy.
[6] | Represents deposits that require a notice period of three months for withdrawal.
[7] | Represents deposits that require a notice period of three months for withdrawal.

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + Details
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- Definition The current cash, cash equivalents and investments that are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes current cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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