Compensation Plans (Details) (USD $)	3 Months Ended	9 Months Ended
Jun. 25, 2011	Jun. 26, 2010	Jun. 25, 2011	Jun. 26, 2010
Stock Option Plans [Member]
Average expected life in years			6	6
Average volatility			52.00%	53.00%
Dividend yield			$ 0	$ 0
Average risk-free interest rate			2.40%	2.80%
Weighted-average fair value of options granted			$ 28.93	$ 15.95
Employee Stock Purchase Plan [Member]
Average expected life, in months			6	6
Average volatility			52.00%	41.00%
Dividend yield			0	0
Average risk-free interest rate			0.20%	0.30%
Weighted-average fair value of options granted			$ 14.05	$ 7.77
Reduction of income before income taxes by stock compensation expenses	3,000,000	2,100,000	7,500,000	5,900,000
Employee Stock Ownership Plan [Member]
Compensation costs			0	1,000,000
Unearned shares	0		0
Deferred Compensation Plan [Member]
Compensation expense			$ 167,000	$ 120,000

Share based compensation arrangement by share based payment award fair value assumptions expected term in months.

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- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
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-Name Statement of Financial Accounting Standard (FAS)
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-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
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- Definition

The amount of plan compensation cost recognized during the period.

+ References

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-Publisher AICPA
-Name Statement of Position (SOP)
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-Paragraph 53
-Subparagraph c
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- Definition

Shares contributed to the ESOP that have not yet been released, committed to be released, or allocated to participant accounts. Suspense shares generally collateralize ESOP debt.

+ References

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-Publisher AICPA
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- Definition

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section D
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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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- Definition

Disclosure of the weighted average expected dividend for an entity using a valuation technique with different dividend rates during the contractual term.

+ References

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- Definition

The range of expected volatilities used and the weighted-average expected volatility for an entity using a valuation technique with different volatilities during the contractual term.

+ References

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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

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

+ References

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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