Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Additional Information (Detail)

v3.10.0.1
Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 24, 2016
Dec. 14, 2017
Nov. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Indefinite-lived intangible assets, impairment charge $ 0 $ 1,800 $ 1,800    
Indefinite-lived intangible assets, carrying value   1,800      
Carrying value of senior subordinated notes 692,153 395,653      
Senior notes          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Carrying value of senior subordinated notes $ 691,575 395,160      
Senior Notes Due February 2028 | Senior notes          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Carrying value of senior subordinated notes   $ 300,000      
Debt instrument interest rate stated, percentage 5.125% 5.125%   5.125%  
Senior Notes Due February 2028 | Senior notes | Estimate of Fair Value Measurement          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Estimated fair value of senior subordinated notes due 2018 $ 285,500        
Senior Notes Due February 2028 | Senior notes | Carrying (Reported) Amount, Fair Value Disclosure          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Carrying value of senior subordinated notes 295,600        
Senior Notes Due November 2023          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Carrying value of senior subordinated notes         $ 400,000
Debt instrument interest rate stated, percentage         6.125%
Senior Notes Due November 2023 | Senior notes | Estimate of Fair Value Measurement          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Estimated fair value of senior subordinated notes due 2018 414,400 $ 427,900      
Senior Notes Due November 2023 | Senior notes | Carrying (Reported) Amount, Fair Value Disclosure          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Carrying value of senior subordinated notes $ 396,000 $ 395,200