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Stock options - Additional Information (Detail) - USD ($) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 04, 2015 | Sep. 05, 2014 | Oct. 31, 2015 | Mar. 09, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average remaining life of options outstanding |  |  | 5 years 2 months 19 days |
Weighted average remaining contractual life of options exercisable |  |  | 3 years 7 months 2 days |
Weighted average life of options vested and expected to vest |  |  | 5 years 2 months 16 days |
Aggregate intrinsic value of options outstanding |  |  | $ 1,500,000 |
Aggregate intrinsic value of options exercisable |  |  | 1,400,000 |
Aggregate intrinsic value of options vested and expected to vest |  |  | 1,500,000 |
Non-vested stock-based arrangements yet to be recognized |  |  | $ 667,000 |
Stock based arrangements yet to be recognized, weighted average period expected to be recognized |  |  | 5 years 9 months 4 days |
Non-employee director annual grant |  |  | $ 30,000 |
Options granted for each non-employee director |  |  | 14,916 |
Value of stock option issued |  |  | $ 15,000 |
Fair value of stock option |  |  | $ 1.01 |
2000 Stock Option Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized |  |  | 1,320,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  | 1,000,000
2010 Stock Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  | 866,843 |
Incentive and Non-Qualified Stock Option Plans |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Additional Shares Of Common Stock Issued | 500,000 | 500,000 |  |
Additional Shares Of Common Stock Issuance Date |  |  | Sep. 05, 2014 |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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