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Deferred Compensation and Retirement Plans (Tables) (Deferred Compensation Plan) | 6 Months Ended
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Oct. 31, 2013
Deferred Compensation Plan |
Components Of Net Periodic Benefit Costs | The components of net periodic benefit costs are as follows:
|  | Three Months Ended October 31, |  |  | Six Months Ended October 31, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
|  | (in thousands) |
Amortization of actuarial loss |  | $ | 779 |  |  | $ | 594 |  |  | $ | 1,559 |  |  | $ | 1,188 |
Interest cost |  |  | 676 |  |  |  | 756 |  |  |  | 1,352 |  |  |  | 1,512 |
Net periodic benefit costs |  | $ | 1,455 |  |  | $ | 1,350 |  |  | $ | 2,911 |  |  | $ | 2,700 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=32704760&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2439-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2410-114920 + Details
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