Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 27, 2014	Sep. 28, 2013
Schedule Of Income Taxes [Line Items]
Federal tax net operating losses	$ 6,600,000
Federal tax net operating losses expiration year	2033
State tax net operating losses	102,600,000
Foreign losses	1,500,000
Federal income tax credits	1,400,000
State income tax credits	3,600,000
Valuation allowances	6,215,000	6,968,000
Period of uncertain tax positions as non-current income tax liabilities unless expected to be paid	1 year
Penalties were accrued related to uncertain tax positions	0	0
Unrecognized tax benefit may be recognized within twelve months as a result of a settlement	100,000
Stock Options [Member]
Schedule Of Income Taxes [Line Items]
Net operating loss carryforwards	1,200,000
Maximum [Member]
Schedule Of Income Taxes [Line Items]
State tax net operating losses expiration year	2034
Federal income tax credits expiration year	2034
State income tax credits expiration year	2030
Accrued interest	$ 100,000	$ 100,000
Minimum [Member]
Schedule Of Income Taxes [Line Items]
State tax net operating losses expiration year	2014
Federal income tax credits expiration year	2024
State income tax credits expiration year	2014