Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Additional Information (Detail)

v2.4.1.9
Stock-Based Compensation - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Tax benefit associated with share-based compensation expense $ 0.6us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense $ 0.7us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Selling, General and Administrative Expenses [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 1.6us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
$ 1.8us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember