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

Stock Repurchase Program - Additional Information (Detail) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Jan. 31, 2015	Feb. 01, 2014	Sep. 11, 2014
Stock Repurchase Program [Line Items]
Repurchase of common stock	$ 39,923,000	$ 37,337,000
2013 Share Repurchase Program [Member]
Stock Repurchase Program [Line Items]
Shares authorized but unused amount revoked			112,664,000
Repurchase of common stock, shares		501
Repurchase of common stock		37,337,000
Repurchase of common stock, average price per share		$ 74.58
2013 Share Repurchase Program [Member] \| Maximum [Member]
Stock Repurchase Program [Line Items]
Repurchase of common stock authorized amount		150,000,000
2014 Share Repurchase Program [Member]
Stock Repurchase Program [Line Items]
Repurchase of common stock, shares	321
Repurchase of common stock	39,923,000
Repurchase of common stock, average price per share	$ 124.31
2014 Share Repurchase Program [Member] \| Maximum [Member]
Stock Repurchase Program [Line Items]
Repurchase of common stock authorized amount	$ 300,000,000