Acquisitions	3 Months Ended
Apr. 30, 2017
Business Combinations [Abstract]
Business Combination Disclosure	Acquisitions Triune Systems, L.L.C On March 4, 2015, the Company acquired Triune Systems, L.L.C. ("Triune"), a privately-held supplier of isolated switching, wireless charging and power management platforms targeted at, among other things, high and low power, high efficiency applications. Under the terms of the purchase agreement, the Company acquired all of the outstanding equity interest in Triune for a guaranteed minimum purchase price of $45.0 million consisting of $35.0 million in cash paid at closing, with an additional cash consideration of $10.0 million of which $9.5 million was paid in September 2015 and $0.5 million was paid in the second quarter of fiscal year 2017. Subject to achieving certain future financial goals (“Triune Earn-out”), up to $70.0 million of contingent consideration will be paid over three years if certain net revenue targets are achieved starting in fiscal year 2016 and ending in fiscal year 2018. An additional payment of up to $16.0 million will be paid after fiscal year 2018 if certain cumulative net revenue and contribution margin targets are achieved. The Triune Earn-out targets for fiscal year 2017 were not met and the Company does not expect the fiscal year 2018 targets to be achieved. The fair value of the Triune Earn-out liability was zero as of April 30, 2017. (See Notes 6 and 12).

Acquisitions

3 Months Ended

Apr. 30, 2017

Acquisitions

Triune Systems, L.L.C

On March 4, 2015, the Company acquired Triune Systems, L.L.C. ("Triune"), a privately-held supplier of isolated switching, wireless charging and power management platforms targeted at, among other things, high and low power, high efficiency applications. Under the terms of the purchase agreement, the Company acquired all of the outstanding equity interest in Triune for a guaranteed minimum purchase price of $45.0 million consisting of $35.0 million in cash paid at closing, with an additional cash consideration of $10.0 million of which $9.5 million was paid in September 2015 and $0.5 million was paid in the second quarter of fiscal year 2017.

Subject to achieving certain future financial goals (“Triune Earn-out”), up to $70.0 million of contingent consideration will be paid over three years if certain net revenue targets are achieved starting in fiscal year 2016 and ending in fiscal year 2018. An additional payment of up to $16.0 million will be paid after fiscal year 2018 if certain cumulative net revenue and contribution margin targets are achieved.

The Triune Earn-out targets for fiscal year 2017 were not met and the Company does not expect the fiscal year 2018 targets to be achieved. The fair value of the Triune Earn-out liability was zero as of April 30, 2017. (See Notes 6 and 12).