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Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified

3 Months Ended

6 Months Ended

Oct. 31, 2014

Oct. 31, 2013

Oct. 31, 2014

Oct. 31, 2013

Accumulated Other Comprehensive Income (Loss) [Line Items]

Accumulated other comprehensive income (loss), beginning balance

$ (5,587)

$ (5,714)

$ (2,388)

$ (2,631)

Unrealized gains (losses) arising during the period

(12,551)

4,392

(16,237)

1,277

Reclassification of realized net losses to net income

467

954

32

Accumulated other comprehensive income (loss), ending balance

(17,671)

(1,322)

(17,671)

(1,322)

Accumulated Translation Adjustment

Accumulated Other Comprehensive Income (Loss) [Line Items]

Accumulated other comprehensive income (loss), beginning balance

11,924

14,533

15,604

17,559

Unrealized gains (losses) arising during the period

(12,555)

4,368

(16,235)

1,342

Accumulated other comprehensive income (loss), ending balance

(631)

18,901

(631)

18,901

Accumulated Defined Benefit Plans Adjustment

Accumulated Other Comprehensive Income (Loss) [Line Items]

Accumulated other comprehensive income (loss), beginning balance

(17,519)

^[1]

(20,236)

(18,006)

^[1]

(20,236)

Unrealized gains (losses) arising during the period

Reclassification of realized net losses to net income

467

^[1]

954

^[1]

Accumulated other comprehensive income (loss), ending balance

(17,052)

^[1]

(20,236)

(17,052)

^[1]

(20,236)

Accumulated Net Unrealized Investment Gain (Loss)

Accumulated Other Comprehensive Income (Loss) [Line Items]

Accumulated other comprehensive income (loss), beginning balance

8

(11)

14

46

Unrealized gains (losses) arising during the period

4

24

(2)

(65)

Reclassification of realized net losses to net income

32

Accumulated other comprehensive income (loss), ending balance

$ 12

$ 13

$ 12

$ 13

[1]	The tax effects on the reclassifications of realized net losses was $0.3 million and $0.6 million for the three and six months ended October 31, 2014, 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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