Selected Balance Sheet Information - Property Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 29, 2018	Sep. 30, 2017
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,373,528	$ 1,372,128
Less: accumulated depreciation	(724,310)	(679,501)
Property, plant and equipment, net	649,218	692,627
Land and improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	189,314	192,256
Buildings and improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	112,490	111,013
Transportation equipment [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	48,339	51,037
Storage facilities [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	110,419	110,573
Equipment, primarily tanks and cylinders [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	858,580	849,175
Computer software [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	49,847	53,826
Construction in progress [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 4,539	$ 4,248

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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