Commitments And Contingencies (Narrative) (Details) - Lindsay, Nebraska Facility [Member] - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Feb. 29, 2016	Nov. 30, 2014	Aug. 31, 2012	May 31, 2018
Site Contingency [Line Items]
Environmental Remediation Expense	$ 13.0	$ 1.5	$ 7.2
Current environmental remediation accrual				$ 16.8

Total costs accrued as of the balance sheet date for environmental loss contingencies.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 25
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346

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Balance Type:	credit
Period Type:	instant