Proposed Acquisition by Duke Energy Corporation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
Jul. 31, 2016	Jul. 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	$ 0.6	$ 2.6
Business Acquisition, Incremental Share Based Compensation, Acceleration	$ 0.6	$ 6.0

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

No definition available.

Name:	pny_BusinessAcquisitionIncrementalShareBasedCompensationAcceleration
Namespace Prefix:	pny_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	pny_ShareholderApprovalVotePercentageAmount
Namespace Prefix:	pny_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessAcquisitionDateOfAcquisitionAgreement1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_BusinessAcquisitionSharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- 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=73531572&loc=d3e1043-128460

+ Details

Name:	us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_BusinessCombinationsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration