Acquisitions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2012
Triade Holding B.V. [Member]
Business Acquisition [Line Items]
Date of acquisition	October 1, 2010
Purchase price of acquired entity	$ 58.5
Cash paid for acquired entity	57.2
Purchase price allocated to cash	1.1
Purchase price allocated to accounts receivable, inventory and certain other assets	181.3
Purchase price allocated to liabilities assumed	185.2
Acquired goodwill	33.9
Triade Holding B.V. [Member] | Customer And Vendor Relationships [Member]
Business Acquisition [Line Items]
Acquired intangible assets	25.5
Estimated useful life (in years)	7
Triade Holding B.V. [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Acquired intangible assets	1.9
Estimated useful life (in years)	10
Mobile Communication Company [Member]
Business Acquisition [Line Items]
Date of acquisition	October 1, 2010
Purchase price of acquired entity	58.8
Cash paid for acquired entity	57.8
Purchase price allocated to cash	1.9
Purchase price allocated to accounts receivable, inventory and certain other assets	116.1
Purchase price allocated to liabilities assumed	84.3
Acquired goodwill	10.3
Percentage contribution to purchase price	50.00%
Mobile Communication Company [Member] | Brightstar Corporation [Member]
Business Acquisition [Line Items]
Percentage contribution to purchase price	50.00%
Mobile Communication Company [Member] | Customer And Vendor Relationships [Member]
Business Acquisition [Line Items]
Acquired intangible assets	14.8
Estimated useful life (in years)	7
Other Acquisitions [Member]
Business Acquisition [Line Items]
Purchase price of acquired entity	36.4
Cash paid for acquired entity	29.0
Purchase price allocated to accounts receivable, inventory and certain other assets	24.4
Purchase price allocated to liabilities assumed	13.9
Acquired goodwill	7.2
Other Acquisitions [Member] | Customer And Vendor Relationships [Member]
Business Acquisition [Line Items]
Acquired intangible assets	13.3
Estimated useful life (in years)	5
Other Acquisitions [Member] | Noncompete Agreements [Member]
Business Acquisition [Line Items]
Acquired intangible assets	$ 5.4
Estimated useful life (in years)	4