Marketable Securities (Tables)

3 Months Ended

Dec. 28, 2019

The amortized cost and fair value of marketable securities as of December 28, 2019 and September 30, 2019 were as follows:



(in thousands)	December 28, 2019
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
Corporate notes/bonds	57,369		130		(19		)	57,480
	$	57,369	$	130	$	(19	)	$	57,480



(in thousands)	September 30, 2019
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
Commercial paper	999		—		—			999
Corporate notes/bonds	56,318		146		(28		)	56,436
	$	57,317	$	146	$	(28	)	$	57,435

Unrealized Gain (Loss) on Investments

The following tables summarize the fair value and gross unrealized losses aggregated by category and the length of time that individual securities have been in a continuous unrealized loss position as of December 28, 2019 and September 30, 2019.



(in thousands)	December 28, 2019
	Less than twelve months					Greater than twelve months					Total
	Fair Value		Gross unrealized loss			Fair Value		Gross unrealized loss			Fair Value		Gross unrealized loss
Corporate notes/bonds	$	17,718	$	(13	)	$	12,814	$	(6	)	$	30,532	$	(19	)



(in thousands)	September 30, 2019
	Less than twelve months			Greater than twelve months			Total
	Fair Value	Gross unrealized loss		Fair Value	Gross unrealized loss		Fair Value	Gross unrealized loss
Corporate notes/bonds	12,419	(14	)	16,369	(14	)	28,788	(28	)

Investments Classified by Contractual Maturity Date

The following table presents our marketable securities by contractual maturity date as of December 28, 2019 and September 30, 2019.



(in thousands)	December 28, 2019				September 30, 2019
	Amortized cost		Fair value		Amortized cost		Fair value
Due in one year or less	$	29,035	$	29,075	$	27,725	$	27,735
Due after one year through three years	28,334		28,405		29,592		29,700
	$	57,369	$	57,480	$	57,317	$	57,435