Stockholders' Equity and Stock Compensation Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
Jan. 01, 2012	Jan. 02, 2011
Stockholders' Equity and Stock Compensation Plans
Stock-based compensation expense	$ 2.9	$ 2.8
Options granted (in shares)	407,249
Exercise price of stock options granted (in dollars per share)	$ 22.53
Weighted-average fair value of stock options granted (in dollars per share)	$ 9.36
Performance-based restricted stock \| Directors and executive officers
Restricted stock award
Granted (in shares)	105,567
Granted, fair value (in dollars per share)	$ 22.53
Vesting period (in years)	3 years
Time-based restricted stock units \| Employees
Restricted stock award
Granted (in shares)	181,348
Granted, fair value (in dollars per share)	$ 22.53
Vesting period (in years)	4 years

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.

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Description of the period of time over 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, which may be expressed in a variety of ways (for example, in years, month and year).

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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).

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Net number of share options (or share units) granted during the period.

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The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

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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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