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Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

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Goodwill and Other Intangibles Goodwill and Other Intangibles (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 31, 2016 USD ($)	Oct. 31, 2015 USD ($)	Oct. 31, 2016 USD ($) ReportingUnits	Oct. 31, 2015 USD ($)	Jan. 31, 2016 USD ($) ReportingUnits	Jan. 31, 2015 USD ($)
Goodwill [Line Items]
Number of Reporting Units \| ReportingUnits			3		4
Goodwill, Gross	$ 52,200	$ 52,209	$ 52,200	$ 52,209
Goodwill	40,703	40,712	40,703	40,712	$ 40,672
Goodwill impairment loss	0	11,497	0	11,497
Goodwill, Impaired, Accumulated Impairment Loss	11,497	11,497	11,497	11,497
Vista Research [Member]
Goodwill [Line Items]
Goodwill impairment loss				11,497
Aerostar [Member]
Goodwill [Line Items]
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount	$ 9,000		$ 9,000
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	(30.00%)		(30.00%)
Goodwill	$ 789		$ 789
Vista Reporting Unit [Member]
Goodwill [Line Items]
Goodwill, Fair Value Disclosure		$ 0		$ 0
Goodwill						$ 11,497
Goodwill impairment loss	$ 11,497