Share Repurchase Activity (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	6 Months Ended		1 Months Ended	6 Months Ended
	Jun. 30, 2013 2013 Program	Aug. 02, 2014 2013 Program		Oct. 31, 2011 2011 Program	Aug. 02, 2014 2011 Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount	$ 350	$ 350	[1]	$ 300	$ 350	[2]
Stock repurchase program, remaining available amount		$ 273.0

[1] In June 2013, the Board of Directors authorized the repurchase of up to $350 million of Signet's common shares (the "2013 Program"). The 2013 Program may be suspended or discontinued at any time without notice. The 2013 Program had $273.0 million remaining as of August 2, 2014.

[2] In October 2011, the Board of Directors authorized the repurchase of up to $300 million of Signet's common shares (the "2011 Program"), which authorization was subsequently increased to $350 million. The 2011 Program was completed as of May 4, 2013.