Quarterly report pursuant to Section 13 or 15(d)

Supplemental Equity Information - Summary of Changes in Carrying Amounts of Equity Attributable to Controlling Interest and Noncontrolling Interest (Details)

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Supplemental Equity Information - Summary of Changes in Carrying Amounts of Equity Attributable to Controlling Interest and Noncontrolling Interest (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 25, 2017
Mar. 31, 2018
Mar. 25, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     $ 637,142 $ 554,587
Comprehensive income $ 46,000 $ 35,393 72,494 42,674
Amortization of share-based awards     4,464 4,222
Restricted share activity, including net share settlement     (6,271) (5,502)
Issuance of common stock, including net share settlement of stock options     (1,130) (13,613)
Tax benefit on stock option exercise, net of tax deficiency       13,142
Distribution to Noncontrolling interest     (1,597) (1,019)
Ending balance 705,102 594,491 705,102 594,491
Total        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     635,686 553,014
Comprehensive income     71,759 41,957
Amortization of share-based awards     4,464 4,222
Restricted share activity, including net share settlement     (6,271) (5,502)
Issuance of common stock, including net share settlement of stock options     (1,130) (13,613)
Tax benefit on stock option exercise, net of tax deficiency       13,142
Ending balance 704,508 593,220 704,508 593,220
Additional Paid In Capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     396,790 393,297
Amortization of share-based awards     4,464 4,222
Restricted share activity, including net share settlement     (6,270) (5,501)
Issuance of common stock, including net share settlement of stock options     (1,132) (13,619)
Tax benefit on stock option exercise, net of tax deficiency       13,142
Ending balance 393,852 391,541 393,852 391,541
Retained Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     239,329 160,501
Comprehensive income     71,481 42,321
Ending balance 310,810 202,822 310,810 202,822
Accumulated Other Comprehensive Income (Loss)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     (951) (1,294)
Comprehensive income     278 (364)
Ending balance (673) (1,658) (673) (1,658)
Noncontrolling Interest        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     1,456 1,573
Comprehensive income     735 717
Distribution to Noncontrolling interest     (1,597) (1,019)
Ending balance 594 1,271 594 1,271
Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     122 120
Restricted share activity, including net share settlement     (1)  
Issuance of common stock, including net share settlement of stock options     2
Ending balance 121 122 121 122
Class A Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     380 374
Restricted share activity, including net share settlement     (1)
Issuance of common stock, including net share settlement of stock options     2 4
Ending balance 382 377 382 377
Class B Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     16 16
Ending balance $ 16 $ 16 $ 16 $ 16