Benefit Plans	12 Months Ended
Apr. 30, 2016
Compensation and Retirement Disclosure [Abstract]
Benefit Plans	BENEFIT PLANS 401(k) plan The Company provides employees with a defined contribution 401(k) plan. The 401(k) plan covers all employees who meet minimum age and service requirements. The Company contributions consist of matching amounts in Company stock and are allocated based on employee contributions. Contributions to the 401(k) plan were $6,560, $5,852, and $5,348 for the years ended April 30, 2016, 2015, and 2014, respectively. On April 30, 2016 and 2015, 1,419,841 and 1,453,251 shares of common stock, respectively, were held by the trustee of the 401(k) plan in trust for distribution to eligible participants upon death, disability, retirement, or termination of employment. Shares held by the 401(k) plan are treated as outstanding in the computation of net income per common share. Supplemental executive retirement plan The Company has a nonqualified supplemental executive retirement plan (SERP) for two of its executive officers, one of whom retired April 30, 2003 and the other on April 30, 2008. The SERP provides for the Company to pay annual retirement benefits, up to 50% of base compensation until death of the officer. If death occurs within twenty years of retirement, the benefits become payable to the officer’s spouse (at a reduced level) until the spouse’s death or twenty years from the date of the officer’s retirement, whichever comes first. The Company has accrued the deferred compensation over the term of employment. The amounts accrued at April 30, 2016 and 2015, respectively, were $5,230 and $5,626. The discount rates used were 3.8% and 4.0%, respectively, at April 30, 2016 and 2015. The amount expensed in fiscal 2016 was $230 and the Company expects to pay $625 per year for each of the next five years. Expense incurred in fiscal 2015 and fiscal 2014 was $326 and $93, respectively. Other post-employment benefits The Company also has severance and/or deferred compensation agreements with three other former employees. The amounts accrued at April 30, 2016 and 2015 were $4,043 and $3,960, respectively. The Company expects to pay $507, $507, $457, $432 and $432 the next five years under the agreements. The expense incurred in fiscal 2016, 2015 and 2014 was $238, $219, and $156 respectively.

BENEFIT PLANS

401(k) plan The Company provides employees with a defined contribution 401(k) plan. The 401(k) plan covers all employees who meet minimum age and service requirements. The Company contributions consist of matching amounts in Company stock and are allocated based on employee contributions. Contributions to the 401(k) plan were $6,560, $5,852, and $5,348 for the years ended April 30, 2016, 2015, and 2014, respectively.

On April 30, 2016 and 2015, 1,419,841 and 1,453,251 shares of common stock, respectively, were held by the trustee of the 401(k) plan in trust for distribution to eligible participants upon death, disability, retirement, or termination of employment. Shares held by the 401(k) plan are treated as outstanding in the computation of net income per common share.

Supplemental executive retirement plan The Company has a nonqualified supplemental executive retirement plan (SERP) for two of its executive officers, one of whom retired April 30, 2003 and the other on April 30, 2008. The SERP provides for the Company to pay annual retirement benefits, up to 50% of base compensation until death of the officer. If death occurs within twenty years of retirement, the benefits become payable to the officer’s spouse (at a reduced level) until the spouse’s death or twenty years from the date of the officer’s retirement, whichever comes first. The Company has accrued the deferred compensation over the term of employment. The amounts accrued at April 30, 2016 and 2015, respectively, were $5,230 and $5,626. The discount rates used were 3.8% and 4.0%, respectively, at April 30, 2016 and 2015. The amount expensed in fiscal 2016 was $230 and the Company expects to pay $625 per year for each of the next five years. Expense incurred in fiscal 2015 and fiscal 2014 was $326 and $93, respectively.

Other post-employment benefits The Company also has severance and/or deferred compensation agreements with three other former employees. The amounts accrued at April 30, 2016 and 2015 were $4,043 and $3,960, respectively. The Company expects to pay $507, $507, $457, $432 and $432 the next five years under the agreements. The expense incurred in fiscal 2016, 2015 and 2014 was $238, $219, and $156 respectively.