Goodwill Impairment Loss and Other Charges Goodwill Impairment Loss and Other Charges (Details) - Cost of Sales [Member] - Vista Research [Member] - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	9 Months Ended
	Oct. 31, 2015	Jul. 31, 2015	Oct. 31, 2015
Pre-contract Deferred Cost Write-off [Line Items]
Pre-contract deferred costs written off	$ 2,933	$ 2,075	$ 2,933
Pre-contract costs deferred to inventory	$ 858