Quarterly report pursuant to Section 13 or 15(d)

Inventories, net - Summary of Inventories, Net of Allowance for Obsolescence (Details)

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Inventories, net - Summary of Inventories, Net of Allowance for Obsolescence (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Sep. 30, 2017
Jun. 24, 2017
Inventory Disclosure [Abstract]      
Raw materials $ 118,826 $ 116,591 $ 118,097
Work in progress 33,306 16,394 16,573
Finished goods 263,416 241,420 243,053
Supplies 12,459 7,696 5,726
Total inventories, net $ 428,007 $ 382,101 $ 383,449