Summary of Significant Accounting Policies and Significant Judgments and Estimates - Stock Options Vested and Expected to Vest (Detail) (USD $)	3 Months Ended
Dec. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares	244,107
Weighted-Average Remaining Contractual Life (years)	6 years 9 months
Weighted-Average Exercise Price	$ 9.09
Exercisable Number of Shares	152,346
Exercisable Weighted Average Exercise Price	$ 7.97
$0.01 - $1.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower limit	$ 0.01
Range of Exercise Prices, Upper limit	$ 1.00
Number of Shares	600
Weighted-Average Remaining Contractual Life (years)	4 months 13 days
Weighted-Average Exercise Price	$ 0.99
Exercisable Number of Shares	600
Exercisable Weighted Average Exercise Price	$ 0.99
$2.01 - $3.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower limit	$ 2.01
Range of Exercise Prices, Upper limit	$ 3.00
Number of Shares	15,288
Weighted-Average Remaining Contractual Life (years)	2 years 8 months 9 days
Weighted-Average Exercise Price	$ 3.00
Exercisable Number of Shares	15,288
Exercisable Weighted Average Exercise Price	$ 3.00
$3.01 - $4.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower limit	$ 3.01
Range of Exercise Prices, Upper limit	$ 4.00
Number of Shares	16,600
Weighted-Average Remaining Contractual Life (years)	3 years 6 months 26 days
Weighted-Average Exercise Price	$ 3.66
Exercisable Number of Shares	16,600
Exercisable Weighted Average Exercise Price	$ 3.67
$4.01 - $5.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower limit	$ 4.01
Range of Exercise Prices, Upper limit	$ 5.00
Number of Shares	13,400
Weighted-Average Remaining Contractual Life (years)	5 years 11 months 12 days
Weighted-Average Exercise Price	$ 4.90
Exercisable Number of Shares	11,900
Exercisable Weighted Average Exercise Price	$ 4.90
$5.01 - $10.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower limit	$ 5.01
Range of Exercise Prices, Upper limit	$ 10.00
Number of Shares	54,400
Weighted-Average Remaining Contractual Life (years)	6 years 5 months 27 days
Weighted-Average Exercise Price	$ 7.43
Exercisable Number of Shares	44,740
Exercisable Weighted Average Exercise Price	$ 7.47
$10.01 - $15.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower limit	$ 10.01
Range of Exercise Prices, Upper limit	$ 15.00
Number of Shares	143,819
Weighted-Average Remaining Contractual Life (years)	7 years 8 months 27 days
Weighted-Average Exercise Price	$ 11.41
Exercisable Number of Shares	63,218
Exercisable Weighted Average Exercise Price	$ 11.30

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

+ 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 (e)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph d(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

+ Details

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ 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 (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(a, b)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

+ Details

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- Definition

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

+ References

+ Details

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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

+ Details

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