v2.4.0.6

Income Taxes (Tables)

12 Months Ended

Dec. 30, 2012

Income Taxes [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	Year Ended
	December 30, 2012				January 1, 2012				January 2, 2011
Current income tax expense	$	6,111			$	5,885			$	4,564
Tax (deficiency) benefit from stock based compensation recorded in equity	(2,567		)		771				4,595
Deferred income tax expense (benefit)	1,030				(761		)		(1,763		)
Total income tax expense	$	4,574			$	5,895			$	7,396

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	Year Ended
	December 30, 2012			January 1, 2012			January 2, 2011
Statutory federal income tax rate	35.0	%		35.0	%		35.0	%
Other, net	0.3	%		(0.8	)%		(0.7	)%
Effective tax rate	35.3	%		34.2	%		34.3	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	December 30, 2012				January 1, 2012
Deferred tax assets:
Current:
Reserves and allowances	$	722			$	583
Deferred rent	86				74
Inventory	295				244
Other	141				18
Noncurrent:
Stock-based compensation	8,657				10,060
Deferred rent	656				721
Financing obligation	219				240
Other	243				31
Gross deferred tax assets	$	11,019			$	11,971
Valuation allowance	(27		)		—
Gross deferred tax assets, net of valuation allowance	$	10,992			$	11,971
Deferred tax liabilities:
Current:
Prepaid expenses	$	(301	)		$	(230	)
Other	(17		)		—
Noncurrent:
Leased building	(234		)		(251		)
Excess of book over tax depreciation and amortization	(1,728		)		(1,748		)
Gross deferred tax liabilities	(2,280		)		(2,229		)
Net deferred tax assets	$	8,712			$	9,742

X

- Details

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

X

- Definition

Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

+ Details

Name:	us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

+ Details

Name:	us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319

+ Details

Name:	us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration