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Product Warranties - Product Warranty (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at Beginning of Period $ 6.3us-gaap_ProductWarrantyAccrual $ 9.3us-gaap_ProductWarrantyAccrual
Provisions 1.5us-gaap_ProductWarrantyAccrualWarrantiesIssued 2.0us-gaap_ProductWarrantyAccrualWarrantiesIssued
Settlements/ Adjustments (1.8)us-gaap_ProductWarrantyAccrualPayments (2.4)us-gaap_ProductWarrantyAccrualPayments
Balance at End of Period $ 6.0us-gaap_ProductWarrantyAccrual $ 8.9us-gaap_ProductWarrantyAccrual