Proposed Acquisition by Duke Energy Corporation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Jan. 31, 2016	Jan. 22, 2016	Oct. 24, 2015
Business Combinations [Abstract]
Business Acquisition, Date of Acquisition Agreement	Oct. 24, 2015
Business Acquisition, Share Price			$ 60
Shareholder Approval Vote, Percentage Amount		66.80%
Business Combination, Acquisition Related Costs	$ 1.5
Business Acquisition, Incremental Share Based Compensation, Acceleration	$ 4.7

The incremental share-based compensation expense related to acceleration of incentive compensation plan awards.

No definition available.

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- Definition

Approval percentage of proposed acquisition by shareholders of outstanding common stock entitled to vote.

+ References

No definition available.

+ Details

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- Definition

Date when the business acquisition agreement was executed, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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- Definition

Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

+ References

No definition available.

+ Details

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- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460

+ Details

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- References

No definition available.

+ Details

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