CASH, CASH EQUIVALENTS, RESTRICTED CASH AND SHORT-TERM INVESTMENTS (Details) - USD ($) $ in Thousands		Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017	Oct. 01, 2016
Cash and Cash Equivalents [Line Items]
Available-for-sale Securities, Short-term Investments, Gross Unrealized Gain		$ 0	$ 0
Available-for-sale Securities, Short-term Investments, Gross Unrealized Loss		0	0
Available-for-sale Securities, Short-term Investments, Fair Value Disclosure		229,000	293,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		364,184	321,148	$ 392,940	$ 423,907
Short-term investments	[1]	229,000	293,000
Cash, Cash Equivalents, Restricted Cash, Restricted Cash Equivalents, and Short-Term Investments		593,184	614,153
Cash, Cash Equivalents, Restricted Cash, Restricted Cash Equivalents, and Short-Term Investments, Gross Unrealized Gain		0	0
Cash, Cash Equivalents, Restricted Cash, Restricted Cash Equivalents, and Short-Term Investments, Gross Unrealized Loss		0	(5)
Cash and cash equivalents, Amortized Cost		364,184	320,630
Cash		201,005	42,446
Cash and Cash Equivalents, Amortized Cost		364,184	320,635
Cash and Cash Equivalents, Gross Unrealized Gain		0	0
Cash and Cash Equivalents, Gross Unrealized Loss		0	(5)
Cash and Cash Equivalents		364,184	320,630
Restricted cash	[2]	0	518
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Amortized Cost		0	518
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Gross Unrealized Gain		0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Gross Unrealized Loss		0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Fair Value Disclosure		0	518
Cash, Cash Equivalents, Restricted Cash, Restricted Cash Equivalents, and Short-Term Investments, Fair Value Disclosure		593,184	614,148
Demand Deposits [Member]
Cash and Cash Equivalents [Line Items]
Available-for-sale Securities, Short-term Investments, Gross Unrealized Gain		0	0
Available-for-sale Securities, Short-term Investments, Gross Unrealized Loss		0	0
Available-for-sale Securities, Short-term Investments, Fair Value Disclosure	[2],[3]	99,000	96,000
Short-term investments		99,000	96,000
Cash [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, Amortized Cost		201,005	42,446
Cash equivalents, Money market funds [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, Amortized Cost		163,172	209,172
Cash Equivalents, Gross Unrealized Gain		0	0
Cash Equivalents, Gross Unrealized Loss		0	(5)
Cash Equivalents, Fair Value Disclosure	[4]	163,172	209,167
Cash equivalents, Time deposits [Member]
Cash and Cash Equivalents [Line Items]
Available-for-sale Securities, Short-term Investments, Gross Unrealized Gain		0	0
Available-for-sale Securities, Short-term Investments, Gross Unrealized Loss		0	0
Available-for-sale Securities, Short-term Investments, Fair Value Disclosure	[2]	130,000	197,000
Short-term investments		130,000	197,000
Cash and cash equivalents, Amortized Cost		7	69,017
Cash Equivalents, Gross Unrealized Gain		0	0
Cash Equivalents, Gross Unrealized Loss		0	0
Cash Equivalents, Fair Value Disclosure	[2]	$ 7	$ 69,017

[1] 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 fiscal years ended 2019 and 2018.

[2] Fair value approximates cost basis.

[3] Represents deposits that require a notice period of three months for withdrawal.

[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.