v2.4.0.6

Inventories (Inventories Stated At Cost) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 30, 2012
Inventory Disclosure [Abstract]
Loose diamonds	$ 1,875	$ 1,583
Fine Jewelry and Other	32,138	31,687
Total Inventories	$ 34,013	$ 33,270

X

- Definition

Carrying amount as of the balance sheet date of jewelry and other inventory that will be used as components of a finished product or held for sale.

+ References

No definition available.

+ Details

Name:	nile_FineJewelryAndOther
Namespace Prefix:	nile_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Carrying amount as of the balance sheet date of loose diamonds that will be used as components of a finished product or held for sale.

+ References

No definition available.

+ Details

Name:	nile_LooseDiamonds
Namespace Prefix:	nile_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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

X

- Definition

Carrying amount (lower of cost or market) as of the balance sheet date of inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer).

+ 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 210.5-02.6(a))

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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 330

-SubTopic 10

-Section 35

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant