Goodwill and Other Intangibles Pre-contract costs written-off (Details) - Vista Research [Member] - Cost of Sales [Member] - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Pre-contract Deferred Cost Write-off [Line Items]
Pre-contract costs deferred to inventory	$ 858	$ 858	$ 2,075		$ 2,933
Pre-contract deferred costs written off	$ 0	$ 2,933		$ 0	$ 2,933