Stockholders' Equity and Stock Compensation Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 30, 2014	Mar. 31, 2013	Mar. 30, 2014	Mar. 31, 2013
Stockholders' Equity and Stock Compensation Plans
Stock-based compensation expense	$ 3.2	$ 2.3	$ 5.5	$ 4.8
Options granted (in shares)	0		354,238
Restricted stock award
Weighted-average fair value of stock options granted (in dollars per share)			$ 9.36
Minimum
Restricted stock award
Exercise price of stock options granted (in dollars per share)			$ 28.58
Maximum
Restricted stock award
Exercise price of stock options granted (in dollars per share)			$ 28.68
Non-employee executive officers and employees
Restricted stock award
Vesting period			4 years
Non-employee director
Restricted stock award
Vesting period			1 year
Performance-based restricted stock | Non-employee directors and executive officers
Restricted stock award
Granted (in shares)			117,067
Granted, fair value (in dollars per share)			$ 28.58
Vesting period			3 years
Time-based restricted stock units
Restricted stock award
Granted (in shares)	125
Granted, fair value (in dollars per share)	$ 28.72
Time-based restricted stock units | Non-employee directors, executive officers and employees
Restricted stock award
Granted (in shares)			224,743
Granted, fair value (in dollars per share)			$ 28.58