Goodwill and Long-Lived Asset Impairment Loss and Other Charges (Goodwill Impairment Loss) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014	Jan. 31, 2015
Goodwill [Line Items]
Impairment of Long-Lived Assets Held-for-use	$ 3,813,000	$ 0	$ 3,813,000	$ 0
Gross goodwill	52,209,000	25,234,000	52,209,000	25,234,000
Goodwill	40,712,000	25,234,000	40,712,000	25,234,000	$ 52,148,000
Goodwill impairment loss	11,497,000	0	11,497,000	0
Vista Reporting Unit [Member]
Goodwill [Line Items]
Impairment of Long-Lived Assets Held-for-use	3,813,000		3,813,000
Excess in carrying value	$ 13,986,000		$ 13,986,000
Excess in carrying value, percentage	(63.60%)		(63.60%)
Goodwill	$ 0	11,497,000	$ 0	11,497,000	$ 11,497,000
Goodwill impairment loss	11,497,000	$ 0	11,497,000	$ 0
Radar Technology and Radar Customers [Member] | Vista Reporting Unit [Member]
Goodwill [Line Items]
Impairment of Long-Lived Assets Held-for-use	3,154,000		3,154,000
Patented Technology [Member] | Vista Reporting Unit [Member]
Goodwill [Line Items]
Impairment of Long-Lived Assets Held-for-use	105,000		105,000
Property, Plant and Equipment [Member] | Vista Reporting Unit [Member]
Goodwill [Line Items]
Impairment of Long-Lived Assets Held-for-use	$ 554,000		$ 554,000