Stock-Based Compensation Stock Option (Details) - Stock Options - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2016	Jul. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award
Options outstanding, beginning balance		41,000
Options exercisable, beginning balance		41,000
Exercised, number of shares	0	(19,000)
Options outstanding, ending balance		22,000	41,000
Options exercisable, ending balance		22,000	41,000
Options outstanding, weighted average exercise price, beginning balance		$ 15.43
Options exercisable, weighted average exercise price, beginning balance		15.43
Exercised, weighted average exercise price		15.01
Options outstanding, weighted average exercise price, ending balance		15.79	$ 15.43
Options exercisable, weighted average exercise price, ending balance		$ 15.79	$ 15.43
Options outstanding, weighted average remaining contractual term		6 months 22 days	11 months
Options exercisable, weighted average remaining contractual term		6 months 22 days	11 months
Options outstanding, aggregate intrinsic value, beginning balance		$ 447
Options exercisable, aggregate intrinsic value, beginning balance		447
Exercised, aggregate intrinsic value		242
Options outstanding, aggregate intrinsic value, ending balance		488	$ 447
Options exercisable, aggregate intrinsic value, ending balance		$ 488	$ 447