Stockholders' Equity and Stock Compensation Plans - Restricted Stock, PSUS and RSUs (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Sep. 28, 2014
Stockholder's equity and stock compensation plans
Vesting period	1 year	1 year
Restricted Stock Program
Stock-based compensation expense	$ 12,964	$ 10,926	$ 10,374
Restricted Stock
Stockholder's equity and stock compensation plans
Initially granted (in shares)	0	0	117,067
Number of Shares
Nonvested balance at the beginning of the period (in shares)	104,000
Granted (in shares)	14,000
Vested (in shares)	(49,000)
Forfeited (in shares)	(34,000)
Nonvested balance at the end of the period (in shares)	35,000	104,000
Vested or expected to vest at the end of the period (in shares)	35,000
Weighted-Average Grant Date Fair Value
Nonvested balance at the beginning of the period (in dollars per share)	$ 27.15
Granted (in dollars per share)	28.58
Vested (in dollars per share)	28.58
Forfeited (in dollars per share)	24.26
Nonvested balance at the end of the period (in dollars per share)	28.58	$ 27.15
Vested or expected to vest at the end of the period (in dollars per share)	$ 28.58
Performance-based restricted stock
Stockholder's equity and stock compensation plans
Period of growth in earnings per share considered to calculate percentage of shares vested	3 years
Additional shares awarded based on performance-based adjustments (in shares)	13,932	15,605
Base rate percentage for performance based adjustments	100.00%
Performance-based restricted stock | Minimum
Stockholder's equity and stock compensation plans
Percentage of shares that ultimately vest depending on fiscal year earnings per share growth rates	0.00%
Performance-based restricted stock | Maximum
Stockholder's equity and stock compensation plans
Percentage of shares that ultimately vest depending on fiscal year earnings per share growth rates	140.00%
PSUs
Stockholder's equity and stock compensation plans
Vesting period	3 years
Percentage of shares that ultimately vest depending on fiscal year earnings per share growth rates	50.00%
Percentage of shares that ultimately vest depending on total shareholder return	50.00%
Number of Shares
Nonvested balance at the beginning of the period (in shares)	139,000
Granted (in shares)	137,777
Nonvested balance at the end of the period (in shares)	277,000	139,000
Weighted-Average Grant Date Fair Value
Nonvested balance at the beginning of the period (in dollars per share)	$ 31.66
Granted (in dollars per share)	31.63
Nonvested balance at the end of the period (in dollars per share)	$ 31.65	$ 31.66
RSUs
Stockholder's equity and stock compensation plans
Vesting period	4 years	4 years
Number of Shares
Nonvested balance at the beginning of the period (in shares)	483,111
Granted (in shares)	216,539	234,685
Vested (in shares)	(180,000)
Forfeited (in shares)	(21,000)
Nonvested balance at the end of the period (in shares)	499,021	483,111
Weighted-Average Grant Date Fair Value
Nonvested balance at the beginning of the period (in dollars per share)	$ 26.75
Granted (in dollars per share)	27.14	$ 27.21
Vested (in dollars per share)	26.03
Forfeited (in dollars per share)	27.11
Nonvested balance at the end of the period (in dollars per share)	$ 27.16	$ 26.75
Restricted Stock, PSUs and RSUs | Restricted Stock Program
Restricted Stock Program
Stock-based compensation expense	$ 10,300	$ 7,500	$ 4,600
Unrecognized compensation cost	$ 13,500