Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Narrative (Details)

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Fair Value Measurements - Narrative (Details) - USD ($)
Dec. 30, 2017
Dec. 14, 2017
Sep. 30, 2017
Dec. 24, 2016
Nov. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Carrying value of senior subordinated notes $ 691,336,000   $ 395,653,000 $ 395,408,000  
Senior notes          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Carrying value of senior subordinated notes 690,839,000   395,160,000 394,564,000  
Senior notes | Senior notes, interest at 5.125%, payable semi-annually, principal due February 2028          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Debt, aggregate principal amount $ 300,000,000        
Debt instrument interest rate stated, percentage 5.125% 5.125%      
Estimated fair value of senior notes $ 300,800,000        
Carrying value of senior subordinated notes 295,500,000        
Senior notes | 6.125% senior notes due in November 2023          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Debt, aggregate principal amount         $ 400,000,000
Debt instrument interest rate stated, percentage         6.125%
Estimated fair value of senior notes 424,200,000   427,900,000 421,400,000  
Carrying value of senior subordinated notes $ 395,400,000   $ 395,200,000 $ 394,600,000