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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Apr. 01, 2017	Mar. 31, 2018	Apr. 01, 2017
Stock option plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted			1.7	1.0
Weighted-average exercise prices			$ 40.76	$ 37.94
Share-based compensation, stock option outstanding	6.6		6.6
Weighted-average exercise price of options outstanding	$ 31.56		$ 31.56
Unrecognized compensation expense	$ 32.5		$ 32.5
Weighted-average period for recognition of unrecognized stock-based compensation, years			2 years 10 months 22 days
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			0.8	1.0
Restricted stock units (RSUs), weighted average grant date fair values			$ 40.75	$ 37.74
Unvested RSUs outstanding	1.9		1.9
Unvested RSUs weighted-average grant date fair value	$ 37.86		$ 37.86
Unrecognized compensation expense	$ 81.1		$ 81.1
Weighted-average period for recognition of unrecognized stock-based compensation, years			2 years 1 month 22 days
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			0.4	0.1
Restricted stock units (RSUs), weighted average grant date fair values			$ 40.86	$ 37.70
Market Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	0.3	0.1
Restricted stock units (RSUs), weighted average grant date fair values			$ 49.45	$ 48.90
Minimum eligible percentage to receive target number of shares of company's common stock			0.00%
Maximum eligible percentage to receive target number of shares of company's common stock			200.00%
Performance stock units vesting period			3 years

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Maximum target number percentage of shares issued based on stock performance.

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Minimum target number percentage of shares that would be issued based on stock price performance.

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- Definition

Period of time that must lapse in order for the restricted stock units to vest.

+ References

No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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=96867065&loc=d3e5070-113901

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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
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-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The number of grants made 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

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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

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-Publisher FASB
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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 10
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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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Net number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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-Publisher FASB
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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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