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Inventories - Narrative (Details) - USD ($) $ in Millions	May 31, 2017	Aug. 31, 2016
Inventory Disclosure [Abstract]
LIFO inventory, difference amount had FIFO inventory valuation method been used	$ 140.9	$ 93.9
Percentage of LIFO inventory	19.00%	19.00%

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- References

No definition available.

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- Definition

Amount by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(c))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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

+ References

No definition available.

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