Stockholders' Equity - Stock Repurchases, Cash Dividend (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		5 Months Ended	9 Months Ended		12 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	May 10, 2017	Aug. 31, 2017	Aug. 31, 2016	May 10, 2017	May 11, 2016
Stock Repurchases
Stock repurchased				$ 1,474	$ 1,951
Cash Dividend
Cash dividend paid	$ 1,514	$ 1,546		$ 1,514	$ 1,546
Cash dividends declared (in dollars per share)				$ 0	$ 0
Stock Repurchases
Stock Repurchases
Stock repurchase program, authorized amount							$ 5,000
Stock repurchased (in shares)			47,173			152,173
Stock repurchased			$ 1,474			$ 4,828