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Accumulated Other Comprehensive Income (Tables)
 3 Months Ended
Jul. 31, 2014
Accumulated Other Comprehensive Income [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following table summarizes the changes in each component of accumulated other comprehensive income (AOCI), net of tax, during the three months ended July 31, 2013 and 2014:
 
Currency Translation Adjustments
 
Cash Flow Hedge Adjustments
 
Postretirement Benefits Adjustments
 
Total AOCI
 
 
 
 
 
 
 
 
Balance at April 30, 2013
$
10

 
$
—

 
$
(221
)
 
$
(211
)
Net other comprehensive income (loss)
(12
)
 
6

 
5

 
(1
)
Balance at July 31, 2013
$
(2
)
 
$
6

 
$
(216
)
 
$
(212
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance at April 30, 2014
$
6

 
$
(4
)
 
$
(190
)
 
$
(188
)
Net other comprehensive income (loss)
(16
)
 
5

 
4

 
(7
)
Balance at July 31, 2014
$
(10
)
 
$
1

 
$
(186
)
 
$
(195
)
Comprehensive Income (Loss) [Table Text Block]
The following table presents the components of net other comprehensive income (loss) during the three months ended July 31, 2013 and 2014:
 
Pre-Tax
 
Tax
 
Net
Three Months Ended July 31, 2013
 
 
 
 
 
Currency translation adjustments
$
(12
)
 
$
—

 
$
(12
)
Cash flow hedge adjustments:
 
 
 
 
 
Net gain (loss) on hedging instruments
10

 
(3
)
 
7

Reclassification to earnings1
(1
)
 
—

 
(1
)
Postretirement benefits adjustments:
 
 
 
 
 
Net actuarial gain (loss) and prior service cost
—

 
—

 
—

Reclassification to earnings2
8

 
(3
)
 
5

Net other comprehensive income (loss)
$
5

 
$
(6
)
 
$
(1
)
 
 
 
 
 
 
Three Months Ended July 31, 2014
 
 
 
 
 
Currency translation adjustments
$
(16
)
 
$
—

 
$
(16
)
Cash flow hedge adjustments:
 
 
 
 
 
Net gain (loss) on hedging instruments
5

 
(1
)
 
4

Reclassification to earnings1
2

 
(1
)
 
1

Postretirement benefits adjustments:
 
 
 
 
 
Net actuarial gain (loss) and prior service cost
—

 
—

 
—

Reclassification to earnings2
6

 
(2
)
 
4

Net other comprehensive income (loss)
$
(3
)
 
$
(4
)
 
$
(7
)
1Pre-tax amount is classified as net sales in the accompanying consolidated statements of operations.
2Pre-tax amount is a component of pension and other postretirement benefit expense (as shown in Note 6).