Acquisitions (Narrative) (Details) (USD $)	12 Months Ended	1 Months Ended		3 Months Ended
	Jan. 31, 2013	Sep. 30, 2012	Nov. 30, 2012	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2015	Nov. 01, 2012	Nov. 01, 2013
Business Acquisition [Line Items]
Decrease to additional paid-in capital	$ 117,220,000
Business Acquisition, Purchase Price Allocation, Goodwill Amount					230,472,000	198,565,000
Brightstar Europe Limited
Business Acquisition [Line Items]
Cash paid to acquire entity		165,900,000
Purchase price premium		85,000,000
Acquisition related costs		900,000
SDG
Business Acquisition [Line Items]
Identifiable intangible assets							134,300,000
Acquisition purchase price			358,000,000
Annual supply commitment, period of commitment			6 years
Tangible assets (includes property and equipment, deferred tax assets and other assets)							6,200,000
Business Acquisition, Purchase Price Allocation, Goodwill Amount							122,600,000
SDG | Customer and Vendor Relationship
Business Acquisition [Line Items]
Identifiable intangible assets							103,100,000
Acquired finite lived intangible assets, useful life (in years)				10 years
SDG | Preferred Supplier Agreement
Business Acquisition [Line Items]
Identifiable intangible assets							31,200,000
Acquired finite lived intangible assets, useful life (in years)				6 years
TDMobility [Member]
Business Acquisition [Line Items]
Identifiable intangible assets								4,200,000
Acquisition purchase price					2,100,000
Tangible assets (includes property and equipment, deferred tax assets and other assets)								4,000,000
Business Acquisition, Purchase Price Allocation, Goodwill Amount								2,500,000
Additional Paid-in Capital
Business Acquisition [Line Items]
Decrease to additional paid-in capital	85,916,000
Additional Paid-in Capital | Brightstar Europe Limited
Business Acquisition [Line Items]
Decrease to additional paid-in capital		85,900,000
Senior Notes
Business Acquisition [Line Items]
Debt, face value		$ 350,000,000			$ 350,000,000	$ 350,000,000
Minimum | TDMobility [Member]
Business Acquisition [Line Items]
Acquired finite lived intangible assets, useful life (in years)					5 years
Maximum | TDMobility [Member]
Business Acquisition [Line Items]
Acquired finite lived intangible assets, useful life (in years)					10 years