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Subsequent Events (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended		6 Months Ended
	Mar. 21, 2017	Mar. 09, 2017	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016
Subsequent Events [Line Items]
Cash dividend declared			$ 0.49	$ 0.42	$ 0.91	$ 0.80
Dividend payable, declared date					Mar. 21, 2017
Dividends payable, date to be paid					Apr. 28, 2017
Dividend payable, record date					Apr. 14, 2017
Subsequent Events [Member]
Subsequent Events [Line Items]
Cash dividend declared	$ 0.49
Maximum [Member] | Subsequent Events [Member]
Subsequent Events [Line Items]
Estimated cost for construction		$ 4.2

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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X

- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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- Definition

Date the dividend to be paid was declared, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

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- Definition

Estimated Cost For Construction Of Improvements

+ References

No definition available.

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