Compensation Plans (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Dec. 26, 2015	Dec. 27, 2014
Compensation Plans
Stock compensation	$ 8.9	$ 10.4
Employee stock options
Compensation Plans
Average expected life	5 years 6 months	5 years 6 months
Average volatility (as a percent)	60.00%	57.00%
Dividend yield (as a percent)	2.45%	0.83%
Risk-free interest rate (as a percent)	1.68%	1.62%
Weighted average grant date fair value (in dollars per share)	$ 23.50	$ 67.11
RSUs \| Minimum
Compensation Plans
Vesting period of award	3 years
RSUs \| Maximum
Compensation Plans
Vesting period of award	4 years
PSUs \| Minimum
Compensation Plans
Vesting period of award	2 years
PSUs \| Maximum
Compensation Plans
Vesting period of award	3 years
RSAs \| Minimum
Compensation Plans
Vesting period of award	3 years
RSAs \| Maximum
Compensation Plans
Vesting period of award	4 years
ESPP
Compensation Plans
Average expected life	6 months	6 months
Average volatility (as a percent)	57.00%	40.00%
Dividend yield (as a percent)	2.16%	0.88%
Risk-free interest rate (as a percent)	0.10%	0.05%
Weighted average grant date fair value (in dollars per share)	$ 16.27	$ 33.94

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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
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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Weighted average expected volatility rate of share-based compensation awards.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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