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CASH, CASH EQUIVALENTS, RESTRICTED CASH AND SHORT-TERM INVESTMENTS (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Sep. 30, 2017 | Apr. 01, 2017 | Oct. 01, 2016 | [3]
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Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items] |  |  |  |  |  |  |
Cash |  | $ 54,378 |  | $ 65,759 |  |  |
Cash and Cash Equivalents, Amortized Cost |  | 340,167 |  | 392,410 |  |  |
Cash and Cash Equivalents, Unrealized Gain |  | 0 |  | 0 |  |  |
Cash and Cash Equivalents, Unrealized Loss |  | (16) |  | 0 |  |  |
Cash and Cash Equivalents, Estimated Fair Value |  | 340,151 |  | 392,410 |  |  |
Restricted Cash |  | 535 | [1] | 530 | [2] |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Amortized Cost |  | 340,702 |  | 392,940 |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  | 340,686 |  | 392,940 |  | $ 435,203 | $ 423,907
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Unrealized Gain |  | 0 |  | 0 |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Unrealized Loss |  | (16) |  | 0 |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Estimated Fair Value |  | 340,686 |  | 392,940 |  |  |
Short term investments, available-for-sale(1) | [4] | 288,000 |  | 216,000 |  |  |
Short-term Investments, Unrealized Gain |  | 0 |  | 0 |  |  |
Short-term Investments, Unrealized Loss |  | 0 |  | 0 |  |  |
Short-term Investments, Estimated Fair Value |  | 288,000 |  | 216,000 |  |  |
Cash, Cash Equivalents, Restricted Cash, Restricted Cash Equivalents, and Short-Term Investments, Amortized Cost |  | 628,702 |  | 608,940 |  |  |
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 |  | (16) |  | 0 |  |  |
Cash, Cash Equivalents, Restricted Cash, Restricted Cash Equivalents, and Short-Term Investments, Estimated Fair Value |  | 628,686 |  | 608,940 |  |  |
Money market funds |  |  |  |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items] |  |  |  |  |  |  |
Cash Equivalents, Amortized Cost |  | 210,809 |  | 232,069 |  |  |
Cash Equivalents, Unrealized Gain |  | 0 |  | 0 |  |  |
Cash Equivalents, Unrealized Loss |  | (16) |  | 0 |  |  |
Cash Equivalents, Estimated Fair Value |  | 210,793 | [5] | 232,069 | [2] |  |
Time deposits |  |  |  |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items] |  |  |  |  |  |  |
Cash Equivalents, Amortized Cost |  | 55,009 |  | 89,087 |  |  |
Cash Equivalents, Unrealized Gain |  | 0 |  | 0 |  |  |
Cash Equivalents, Unrealized Loss |  | 0 |  | 0 |  |  |
Cash Equivalents, Estimated Fair Value |  | 55,009 | [1] | 89,087 | [2] |  |
Short term investments, available-for-sale(1) |  | 192,000 |  | 120,000 |  |  |
Short-term Investments, Unrealized Gain |  | 0 |  | 0 |  |  |
Short-term Investments, Unrealized Loss |  | 0 |  | 0 |  |  |
Short-term Investments, Estimated Fair Value |  | 192,000 | [1] | 120,000 | [2] |  |
Commercial paper |  |  |  |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items] |  |  |  |  |  |  |
Cash Equivalents, Amortized Cost |  | 19,971 |  | 5,495 |  |  |
Cash Equivalents, Unrealized Gain |  | 0 |  | 0 |  |  |
Cash Equivalents, Unrealized Loss |  | 0 |  | 0 |  |  |
Cash Equivalents, Estimated Fair Value |  | 19,971 | [1] | 5,495 | [2] |  |
Deposits |  |  |  |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items] |  |  |  |  |  |  |
Short term investments, available-for-sale(1) |  | 96,000 | [6] | 96,000 | [7] |  |
Short-term Investments, Unrealized Gain |  | 0 |  | 0 |  |  |
Short-term Investments, Unrealized Loss |  | 0 |  | 0 |  |  |
Short-term Investments, Estimated Fair Value |  | $ 96,000 | [1],[6] | $ 96,000 | [2],[7] |  |
[1] | Fair value approximates cost basis.
[2] | Fair value approximates cost basis.
[3] | * Certain time deposits as at October 1, 2016 have been corrected from cash equivalents to short-term investments for comparative purposes.
[4] | 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 six months ended March 31, 2018 and April 1, 2017.
[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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