Cash Equivalents and Marketable Securities - Contractual Maturities of Held to Maturity Investments (Detail) (USD $)	Dec. 28, 2013	Sep. 28, 2013
Cash And Cash Equivalents [Abstract]
Contractual maturities, Within 1 year, Cost	$ 549,623
Contractual maturities, After 1 year through 5 years, Cost	1,506,653
Total, Cost	2,056,276
Contractual maturities, Within 1 year, Amortized Cost	518,709	522,856
Contractual maturities, After 1 year through 5 years, Amortized Cost	1,453,870	1,462,622
Total, Amortized Cost	$ 1,972,579