Acquisitions - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended				0 Months Ended	9 Months Ended		0 Months Ended	12 Months Ended	0 Months Ended	3 Months Ended	9 Months Ended				9 Months Ended
	Nov. 01, 2014	Nov. 01, 2014	Nov. 01, 2014 4.700% senior unsecured notes due in 2024	Nov. 01, 2014 2 Year Revolving Asset-Backed Variable Funding Notes	Nov. 01, 2014 Term loan	Feb. 19, 2014 Bridge Facility	Nov. 01, 2014 Bridge Facility	Nov. 01, 2014 Bridge Facility Other	Nov. 04, 2013 Botswana Diamond Polishing Factory Acquisition	Feb. 01, 2014 Botswana Diamond Polishing Factory Acquisition	May 29, 2014 Zale Corporation	Nov. 01, 2014 Zale Corporation	Nov. 01, 2014 Zale Corporation	May 29, 2014 Zale Corporation	Feb. 02, 2013 Zale Corporation	Nov. 01, 2014 Zale Corporation 4.700% senior unsecured notes due in 2024	Nov. 01, 2014 Zale Corporation 2 Year Revolving Asset-Backed Variable Funding Notes	Nov. 01, 2014 Zale Corporation Term loan
Business Acquisition [Line Items]
Total consideration									$ 9,100,000		$ 1,458,000,000
Property, plant and equipment acquired										5,500,000				99,600,000
Goodwill acquired										3,600,000
Goodwill expected deductible for income tax purposes										0
Percentage of outstanding shares acquired														100.00%
Common stock price per share														$ 21
Cash paid to extinguish outstanding debt											478,200,000
Debt carrying amount	1,394,900,000	1,394,900,000	398,400,000	600,000,000	395,000,000									1,400,000,000	1,400,000,000	400,000,000	600,000,000	400,000,000
Debt instrument, maturity period						364 days											2 years	5 years
Purchase accounting adjustments												27,600,000
Change in fair value liability												26,100,000
Revenue from sale over deferred period													10 years
Acquisition-related costs charged to condensed consolidated income statement	9,400,000	48,600,000
Debt issuance costs incurred and capitalized							$ 4,000,000	$ 4,000,000