Stockholders' Equity - Stock Repurchases, Cash Dividend (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	May 27, 2016	Feb. 29, 2016	Feb. 28, 2015	Aug. 31, 2016	Aug. 31, 2015	Mar. 31, 2016
Stock Repurchases
Stock repurchased				$ 1,951
Cash Dividend
Cash dividend paid		$ 1,546	$ 1,030	$ 1,546	$ 1,030
Cash dividends declared (in dollars per share)				$ 0	$ 0
Common Stock
Stock Repurchases
Stock repurchase program, authorized amount						$ 5,000
Stock repurchased (in shares)	60,000
Stock repurchased	$ 1,951