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Investments In Available-For-Sale Securities (Amortized Cost And Fair Value Of Securities Available-For-Sale) (Details) (USD $)
In Thousands, unless otherwise specified

Jul. 31, 2012

Apr. 30, 2012

Schedule of Available-for-sale Securities [Line Items]

Investments in available-for-sale securities, Amortized Cost

$ 375,545

$ 366,428

Investments in available-for-sale securities, Gross Unrealized Gains

6,324

6,045

Gross Unrealized Losses

(78)

^[1]

(121)

^[1]

Investments in available-for-sale securities, Fair Value

381,791

372,352

Mortgage-Backed Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Investments in available-for-sale securities, Amortized Cost

7,900

8,100

Gross Unrealized Losses

5

21

Short-Term [Member] | Municipal Bonds [Member]

Schedule of Available-for-sale Securities [Line Items]

Investments in available-for-sale securities, Amortized Cost

1,006

1,008

Investments in available-for-sale securities, Gross Unrealized Gains

20

29

Investments in available-for-sale securities, Fair Value

1,026

1,037

Long-Term [Member]

Schedule of Available-for-sale Securities [Line Items]

Investments in available-for-sale securities, Amortized Cost

374,539

365,420

Investments in available-for-sale securities, Gross Unrealized Gains

6,304

6,016

Gross Unrealized Losses

(78)

^[1]

(121)

^[1]

Investments in available-for-sale securities, Fair Value

380,765

371,315

Long-Term [Member] | Municipal Bonds [Member]

Schedule of Available-for-sale Securities [Line Items]

Investments in available-for-sale securities, Amortized Cost

4,221

4,236

Investments in available-for-sale securities, Gross Unrealized Gains

406

396

Investments in available-for-sale securities, Fair Value

4,627

4,632

Long-Term [Member] | Mortgage-Backed Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Investments in available-for-sale securities, Amortized Cost

370,318

361,184

Investments in available-for-sale securities, Gross Unrealized Gains

5,898

5,620

Gross Unrealized Losses

(78)

^[1]

(121)

^[1]

Investments in available-for-sale securities, Fair Value

$ 376,138

$ 366,683

[1]

At July 31, 2012, mortgage-backed securities with a cost of $7.9 million and gross unrealized losses of $5 thousand had been in a continuous loss position for more than twelve months. At April 30, 2012, mortgage-backed securities with a cost of $8.1 million and gross unrealized losses of $21 thousand had been in a continuous loss position for more than twelve months

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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