Disclosure of Compensation Related Costs, Share Based Payments - Schedule of Compensation Grants (Details) - 2009 Stock Incentive Plan - USD ($) $ in Thousands							9 Months Ended
	Jun. 05, 2015	Sep. 19, 2014	Jun. 06, 2014	Sep. 13, 2013	Jun. 19, 2013	Jun. 07, 2013	Jan. 31, 2016
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Grants in period (in shares)							104,200
Officers & Key Employees | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Grants in period (in shares)	104,200		91,000		77,650	77,650
Fair value of awards during period	$ 9,135		$ 6,584		$ 4,816	$ 4,816
Officers & Key Employees | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award
Grants in period (in shares)	48,913		30,538
Fair value of awards during period	$ 4,288		$ 2,209
Non-Employee Board Members | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Grants in period (in shares)				14,000
Fair value of awards during period				$ 958
Non-Employee Board Members | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award
Grants in period (in shares)		13,955
Fair value of awards during period		$ 990