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NOTE 9. SHARE-BASED COMPENSATION (Details) - USD ($) $ in Thousands	3 Months Ended
	Feb. 29, 2016	Feb. 28, 2015
Note 9. Share-based Compensation Details
Stock options	$ 3,668	$ 4,104
Performance share unit plan	989	1,170
Deferred share unit plan	51	55
Net Share Based Compensation	$ 4,708	$ 5,329

X

- References

No definition available.

+ Details

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Namespace Prefix:	NG_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	NG_PerformanceShareUnitPlan
Namespace Prefix:	NG_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	NG_SharebasedCompensationDetailsAbstract
Namespace Prefix:	NG_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	NG_StockOptions
Namespace Prefix:	NG_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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Balance Type:	debit
Period Type:	duration