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Inventories (Narrative) (Details)	Mar. 31, 2018	Sep. 30, 2017
Inventory Disclosure [Abstract]
Percentage of FIFO Inventory	64.00%	63.00%

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- References

No definition available.

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Namespace Prefix:	us-gaap_
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- Definition

The percentage of FIFO (first in first out) inventory to total inventory as of the balance sheet date if other than 100 percent.

+ References

No definition available.

+ Details

Name:	us-gaap_PercentageOfFIFOInventory
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant