Fair Value Measurements (Details Textual) (Fair Value Inputs Level 2 [Member], USD $) In Thousands, unless otherwise specified	Apr. 28, 2012
Fair Value Inputs Level 2 [Member]
Fair Value Measurements (Textual) (Abstract)
Financial liabilities related to non-qualified deferred compensation plan	$ 2,486

Financial liabilities related to non-qualified deferred compensation plan.

No definition available.

Name:	ulta_FinancialLiabilitiesRelatedToNonQualifiedDeferredCompensationPlan
Namespace Prefix:	ulta_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant