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Stock-Based Compensation - Additional Information 1 (Detail) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2012 USD ($) Employees | Sep. 26, 2015 USD ($) Installment $ / shares shares | Sep. 27, 2014 USD ($) $ / shares shares | Sep. 28, 2013 USD ($) $ / shares shares | Sep. 25, 2010 | Sep. 26, 2009 | Sep. 27, 2008 | Sep. 29, 2012 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of affected employees | Employees | 250 |  |  |  |  |  |  |
Percentage of shares covered by performance-based awards | 20.00% |  |  |  |  |  |  |
Recorded additional compensation cost | $ 0 |  |  |  |  |  |  |
Unvested options |  | $ 3,300,000 |  |  |  |  |  |
Options subject to performance based vesting criteria |  | $ 300,000 |  |  |  |  |  |
Dividend during expected term | $ / shares |  | $ 0 |  |  |  |  |  |
Stock Options [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of vesting installments | Installment |  | 4 |  |  |  |  |  |
Expiration period approximately |  | 6 years |  |  |  |  |  |
Expected life of option award |  | 3 years 7 months 6 days | 3 years 6 months | 3 years 6 months |  |  |  |
Stock price volatility |  | 30.30% | 34.30% | 34.80% |  |  |  |
Risk free interest rates |  | 1.30% | 1.60% | 1.20% |  |  |  |
Weighted average grant date fair value of options granted | $ / shares |  | $ 2.51 | $ 1.93 | $ 1.72 |  |  |  |
Total intrinsic value of options exercised |  | $ 5,900,000 | $ 1,400,000 | $ 1,100,000 |  |  |  |
Total unrecognized compensation cost related to nonvested stock options |  | $ 4,800,000 |  |  |  |  |  |
Nonvested stock options remaining weighted average vesting period |  | 2 years |  |  |  |  |  |
Stock Options [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Outstanding options to purchase common stock | $ / shares |  | $ 6.43 | $ 6.43 | $ 4.60 |  |  |  |
Stock Options [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Outstanding options to purchase common stock | $ / shares |  | $ 15.00 | $ 16.23 | $ 16.23 |  |  |  |
Restricted Stock Awards [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total unrecognized compensation cost related to nonvested stock options |  | $ 10,500,000 |  |  |  |  |  |
Nonvested stock options remaining weighted average vesting period |  | 2 years |  |  |  |  |  |
Restricted stock awards outstanding, shares | shares |  | 1,550,000 | 1,609,000 | 894,000 |  |  |  | 785,000
Share based payment award vesting conditional period of employment |  | 5 years |  |  |  |  |  |
Bonus earned in vested shares |  | $ 6,400,000 |  |  |  |  |  |
Share based payment award, shares granted and vested | shares |  | 570,000 |  |  |  |  |  |
Granted, Weighted Average Grant Date Fair Value per Share | $ / shares |  | $ 10.55 | $ 7.98 | $ 9.26 |  |  |  |
Aggregate fair value as of the vesting date of restricted shares |  | $ 3,200,000 | $ 1,700,000 | $ 3,400,000 |  |  |  |
Performance Shares [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Percentage of options granted |  |  |  |  | 20.00% | 60.00% | 100.00% |

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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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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition An excess of the fair value of the modified award over the fair value of the award immediately before the modification. + 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 (h)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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