Note 5 - Stock-Based Compensation (Detail) - Stock Option Activity (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Dec. 29, 2012
Outstanding at September 29, 2012 (in Shares)	1,160
Outstanding at December 29, 2012 (in Shares)	1,132
Outstanding at December 29, 2012	6 years 6 months
Outstanding at December 29, 2012 (in Dollars)	$ 1,658
Vested and anticipated to vest in the future at December 29, 2012 (in Shares)	1,119
Vested and anticipated to vest in the future at December 29, 2012	6 years 171 days
Vested and anticipated to vest in the future at December 29, 2012 (in Dollars)	1,643
Exercisable at December 29, 2012 (in Shares)	773
Exercisable at December 29, 2012	5 years 171 days
Exercisable at December 29, 2012 (in Dollars)	1,277
Exercised (in Shares)	(28)
Exercised (in Dollars)	$ 276
Minimum [Member]
Outstanding at September 29, 2012	$ 0.36
Outstanding at December 29, 2012	$ 5.43
Exercised	$ 0.36
Maximum [Member]
Outstanding at September 29, 2012	$ 20.27
Outstanding at December 29, 2012	$ 20.27
Exercised	$ 9.16
Weighted Average [Member]
Outstanding at September 29, 2012	$ 11.09
Outstanding at December 29, 2012	$ 11.31
Vested and anticipated to vest in the future at December 29, 2012	$ 11.31
Exercisable at December 29, 2012	$ 11.42
Exercised	$ 2.22

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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