Summary of Significant Accounting Policies and Significant Judgments and Estimates - Fair Value of Financial Instruments (Detail) (USD $)	Mar. 28, 2015	Sep. 27, 2014
Fair Value Inputs Liabilities Quantitative Information Financial Statement Captions [Line Items]
Available-for-sale securities, Estimated Fair Value	$ 1,855,653	$ 3,218,333
Debt and Certificates of Deposits [Member]
Fair Value Inputs Liabilities Quantitative Information Financial Statement Captions [Line Items]
Available-for-sale securities, Estimated Fair Value	1,022,034	1,416,890
Debt and Certificates of Deposits [Member] | Certificates of Deposit [Member]
Fair Value Inputs Liabilities Quantitative Information Financial Statement Captions [Line Items]
Available-for-sale securities, Estimated Fair Value	1,022,034	1,416,890
Mutual Funds [Member]
Fair Value Inputs Liabilities Quantitative Information Financial Statement Captions [Line Items]
Available-for-sale securities, Estimated Fair Value	833,619	1,801,443
Mutual Funds [Member] | Money Market Funds [Member]
Fair Value Inputs Liabilities Quantitative Information Financial Statement Captions [Line Items]
Available-for-sale securities, Estimated Fair Value	833,619	1,801,443
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Inputs Liabilities Quantitative Information Financial Statement Captions [Line Items]
Available-for-sale securities, Estimated Fair Value	833,619	1,801,443
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mutual Funds [Member]
Fair Value Inputs Liabilities Quantitative Information Financial Statement Captions [Line Items]
Available-for-sale securities, Estimated Fair Value	833,619	1,801,443
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mutual Funds [Member] | Money Market Funds [Member]
Fair Value Inputs Liabilities Quantitative Information Financial Statement Captions [Line Items]
Available-for-sale securities, Estimated Fair Value	833,619	1,801,443
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Inputs Liabilities Quantitative Information Financial Statement Captions [Line Items]
Available-for-sale securities, Estimated Fair Value	1,022,034	1,416,890
Significant Other Observable Inputs (Level 2) [Member] | Debt and Certificates of Deposits [Member]
Fair Value Inputs Liabilities Quantitative Information Financial Statement Captions [Line Items]
Available-for-sale securities, Estimated Fair Value	1,022,034	1,416,890
Significant Other Observable Inputs (Level 2) [Member] | Debt and Certificates of Deposits [Member] | Certificates of Deposit [Member]
Fair Value Inputs Liabilities Quantitative Information Financial Statement Captions [Line Items]
Available-for-sale securities, Estimated Fair Value	$ 1,022,034	$ 1,416,890