v2.4.0.8

Preferred Stock (Details)	Dec. 29, 2013
Preferred Stock [Abstract]
Undesignated preferred stock authorized for future issuance	5,000,000

X

- Details

Name:	nile_PreferredStockAbstract
Namespace Prefix:	nile_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Aggregate number of nonredeemable preferred shares reserved for future issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant