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Other Balance Sheet Information - Other Balance Sheet Information of Inventories (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 27, 2014
Sep. 27, 2014
Balance Sheet Related Disclosures [Abstract]    
Raw materials $ 112.0us-gaap_InventoryRawMaterialsNetOfReserves $ 115.6us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process 53.0us-gaap_InventoryWorkInProcessNetOfReserves 57.1us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 145.3us-gaap_InventoryFinishedGoodsNetOfReserves 157.9us-gaap_InventoryFinishedGoodsNetOfReserves
Inventories $ 310.3us-gaap_InventoryNet $ 330.6us-gaap_InventoryNet