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Investments - Summary of Available for Sale Investments (Detail) - USD ($) $ in Thousands	Sep. 27, 2019	Sep. 28, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 101,224	$ 98,697
Gross Unrealized Holding Gains	113	0
Gross Unrealized Holding Losses	(111)	(476)
Aggregate Fair Value	101,226	98,221
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	29,578	28,731
Gross Unrealized Holding Gains	112	0
Gross Unrealized Holding Losses	(93)	(460)
Aggregate Fair Value	29,597	28,271
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	71,646	69,966
Gross Unrealized Holding Gains	1	0
Gross Unrealized Holding Losses	(18)	(16)
Aggregate Fair Value	$ 71,629	$ 69,950

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Topic 320
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-Section 50
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+ References

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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