Ulta Beauty, Inc. Annual report pursuant to Section 13 and 15(d)

Valuation and Qualifying Accounts - Valuation and Qualifying Accounts (Detail)

Valuation and Qualifying Accounts - Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2015	Feb. 01, 2014	Feb. 02, 2013
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 915	$ 973	$ 556
Charged to costs and expenses	874	300	419
Deductions	(443)	(358)	(2)
Balance at end of period	1,346	915	973
Shrink Reserve [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	9,358	4,020	2,445
Charged to costs and expenses	22,374	16,298	8,077
Deductions	(20,134)	(10,960)	(6,502)
Balance at end of period	11,598	9,358	4,020
Inventory - Lower of Cost or Market Reserve [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	4,861	2,364	2,070
Charged to costs and expenses	4,368	4,522	1,099
Deductions	(3,976)	(2,025)	(805)
Balance at end of period	5,253	4,861	2,364
Insurance: Workers Comp / General Liability Prepaid Asset [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	(1,817)	(2,400)	(2,084)
Charged to costs and expenses	6,899	7,060	4,864
Deductions	(6,871)	(6,477)	(5,180)
Balance at end of period	(1,789)	(1,817)	(2,400)
Insurance: Employee Health Care Accrued Liability [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	2,606	2,232	1,929
Charged to costs and expenses	41,335	34,422	26,584
Deductions	(41,506)	(34,048)	(26,281)
Balance at end of period	$ 2,435	$ 2,606	$ 2,232