Inventories, Additional Information (Details) - USD ($) $ in Millions	Dec. 30, 2017	Sep. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
LIFO inventory amount	$ 26.5		$ 14.4
FIFO cost of inventories	111.0		76.6
Average cost basis inventories	43.9		43.8
Liquidation of LIFO inventory layers deferred			2.5
Liquidation of LIFO inventory layers			3.3
Excess inventory		$ 38.9
FIFO value of inventory consigned to others	$ 4.4		$ 2.5