Inventories, net - Summary of Inventories, Net of Allowance for Obsolescence (Details) - USD ($) $ in Thousands	Mar. 26, 2016	Sep. 26, 2015	Mar. 28, 2015
Inventory, Net [Abstract]
Raw materials	$ 113,779	$ 94,969	$ 99,490
Work in progress	15,267	15,268	15,601
Finished goods	252,453	215,673	252,104
Supplies	9,255	10,036	15,133
Total inventories, net	$ 390,754	$ 335,946	$ 382,328

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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-Subparagraph (SX 210.5-02.6(a)(1))
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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods.

+ References

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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