Disclosure of Compensation Related Costs, Share Based Payments - Schedule of Compensation Grants (Details) - 2009 Stock Incentive Plan - USD ($) $ in Thousands									6 Months Ended
	Sep. 16, 2016	Jun. 03, 2016	Apr. 12, 2016	Sep. 18, 2015	Jun. 05, 2015	Sep. 19, 2014	Jun. 06, 2014	Sep. 13, 2013	Oct. 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)	8,941			7,748		13,955
Fair Value at Grant Date	$ 1,064			$ 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