Acquisitions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Nov. 04, 2013	Feb. 01, 2014
Business Acquisition [Line Items]
Goodwill acquired		$ 2.2	[1]
Botswana Diamond Polishing Factory Acquisition
Business Acquisition [Line Items]
Total Consideration	9.1
Property, plant and equipment acquired		5.5
Goodwill acquired		3.6
Goodwill expected deductible for income tax purposes		$ 0

[1] See Note 18 for additional discussion of the goodwill recorded by the Company during Fiscal 2014.