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Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands

12 Months Ended

Apr. 30, 2015

Apr. 30, 2014

Apr. 30, 2013

Accumulated Other Comprehensive Income (Loss) [Line Items]

Accumulated other comprehensive income (loss), beginning balance

$ (2,388)

$ (2,631)

$ 7,191

Unrealized (losses) gains arising during the period

(40,122)

(1,883)

(11,274)

Reclassification of realized net losses (gains) to net income

1,887

2,126

1,452

Accumulated other comprehensive income (loss), ending balance

(40,623)

(2,388)

(2,631)

Accumulated Translation Adjustment

Accumulated Other Comprehensive Income (Loss) [Line Items]

Accumulated other comprehensive income (loss), beginning balance

15,604

17,559

22,813

Unrealized (losses) gains arising during the period

(36,523)

(1,955)

(5,254)

Accumulated other comprehensive income (loss), ending balance

(20,919)

15,604

17,559

Accumulated Defined Benefit Plans Adjustment

Accumulated Other Comprehensive Income (Loss) [Line Items]

Accumulated other comprehensive income (loss), beginning balance

^[1]

(18,006)

(20,236)

(15,658)

Unrealized (losses) gains arising during the period

^[1]

(3,589)

136

(6,033)

Reclassification of realized net losses (gains) to net income

^[1]

1,887

2,094

1,455

Accumulated other comprehensive income (loss), ending balance

^[1]

(19,708)

(18,006)

(20,236)

Accumulated Net Unrealized Investment Gain (Loss)

Accumulated Other Comprehensive Income (Loss) [Line Items]

Accumulated other comprehensive income (loss), beginning balance

14

46

36

Unrealized (losses) gains arising during the period

(10)

(64)

13

Reclassification of realized net losses (gains) to net income

32

(3)

Accumulated other comprehensive income (loss), ending balance

$ 4

$ 14

$ 46

[1]

The tax effects on unrealized (losses) gains of $(2.3) million, $0.07 million and $(3.8) million as of April 30, 2015, 2014 and 2013, respectively. The tax effects on reclassifications of realized net losses of $1.2 million, $1.0 million and $0.9 million as of April 30, 2015, 2014 and 2013, respectively.

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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