Disclosure of Compensation Related Costs, Share Based Payments - Schedule of Compensation Grants (Details) - 2009 Stock Incentive Plan - USD ($) $ in Thousands								3 Months Ended
	Jun. 03, 2016	Apr. 12, 2016	Sep. 18, 2015	Jun. 05, 2015	Sep. 19, 2014	Jun. 06, 2014	Sep. 13, 2013	Jul. 31, 2016
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Shares Granted (in shares)								111,150
Non-employee board members | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Shares Granted (in shares)							14,000
Fair Value at Grant Date							$ 958
Non-employee board members | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award
Shares Granted (in shares)			7,748		13,955
Fair Value at Grant Date			$ 856		$ 990
Officers & Key employees | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Shares Granted (in shares)	111,150			104,200		91,000
Fair Value at Grant Date	$ 13,849			$ 9,135		$ 6,584
Officers & Key employees | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award
Shares Granted (in shares)	40,996			48,913		30,538
Fair Value at Grant Date	$ 5,108			$ 4,288		$ 2,209
CEO | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award
Shares Granted (in shares)		10,000
Fair Value at Grant Date		$ 1,060