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Period Type:	duration

Represents pro forma diluted earnings per share from discontinued operations of the acquired entity as if the business combination had been completed at the beginning of the period.

No definition available.

Name:	np_BusinessAcquisitionProFormaIncomeLossFromDiscontinuedOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareDiluted
Namespace Prefix:	np_
Data Type:	num:perShareItemType
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Represents pro forma income from discontinued operations of the acquired entity as if the business combination had been completed at the beginning of the period.

No definition available.

Name:	np_BusinessAcquisitionsProFormaIncomeLossFromDiscontinuedOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax
Namespace Prefix:	np_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the pro forma operating income during the period as if the business combination or combinations had been completed at the beginning of the period.

No definition available.

Name:	np_BusinessAcquisitionsProFormaOperatingIncomeLoss
Namespace Prefix:	np_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

Name:	us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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Data Type:	num:perShareItemType
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Per basic share amount of pro forma income from continuing operations, after tax, as if the business combination had been completed at the beginning of a period.

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Per diluted share amount of pro forma income from continuing operations, after tax, as if the business combination had been completed at the beginning of a period.

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Amount after tax of pro forma income from continuing operations as if the business combination had been completed at the beginning of a period.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.