Short-Term Investments (Tables)

12 Months Ended

Oct. 03, 2020

Cash, Cash Equivalents, and Short-term Investments [Abstract]

Schedule of cash, cash equivalents and short-term investments

Cash, cash equivalents and short-term investments consist of the following (in thousands):

	Fiscal 2020 year-end
	Cost Basis		Unrealized Gains		Unrealized Losses		Fair Value
Cash and cash equivalents	$	440,258	$	—	$	—	$	440,258
Short-term investments:
Available-for-sale securities:
U.S. Treasury and agency obligations	$	35,311	$	36	$	(1)	$	35,346
Total short-term investments	$	35,311	$	36	$	(1)	$	35,346

	Fiscal 2019 year-end
	Cost Basis		Unrealized Gains		Unrealized Losses		Fair Value
Cash and cash equivalents	$	305,833	$	—	$	—	$	305,833
Short-term investments:
Available-for-sale securities:
U.S. Treasury and agency obligations	$	120	$	—	$	—	$	120
Total short-term investments	$	120	$	—	$	—	$	120

Debt Securities, Available-for-sale

The amortized cost and estimated fair value of available-for-sale investments in debt securities as of October 3, 2020 and September 28, 2019 classified as short-term investments on our consolidated balance sheets, were as follows (in thousands):

	Fiscal year-end
	2020				2019
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Investments in available-for-sale debt securities due in less than one year	$	35,311	$	35,346	$	120	$	120