Quarterly report pursuant to Section 13 or 15(d)

Repurchase of Common Stock (Details)

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Repurchase of Common Stock (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Jul. 01, 2017
Jun. 03, 2017
May 06, 2017
Jul. 01, 2017
Jul. 01, 2017
Class of Stock [Line Items]          
Authorized amount $ 40,000,000     $ 40,000,000 $ 40,000,000
Shares repurchased (in shares)       122,265  
Stock repurchased during period, value         $ 2,400,000
Aggregated number of shares repurchased (in shares) 2,698,458     2,698,458 2,698,458
Aggregated shares repurchased, value $ 34,900,000     $ 34,900,000 $ 34,900,000
Dollar Value of Shares that May Yet Be Purchased Under the Plans $ 5,100,000     $ 5,100,000 5,100,000
Common Stock          
Class of Stock [Line Items]          
Shares repurchased (in shares) 33,362 67,903 21,000 122,265  
Average Price Paid per Share(usd per share) $ 20.12 $ 19.26 $ 18.12 $ 19.30  
Dollar Value of Shares that May Yet Be Purchased Under the Plans $ 5,100,000 $ 5,800,000 $ 7,100,000 $ 5,100,000 $ 5,100,000
Publicly Announced Plan | Common Stock          
Class of Stock [Line Items]          
Shares repurchased (in shares) 33,362 67,903 21,000 122,265