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Derivative Financial Instruments and Hedging Activities (Tables)
 12 Months Ended
Apr. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of fair values of derivative instruments affecting statements of operations
The following table presents the pre-tax impact that changes in the fair value of our derivative instruments and non-derivative hedging instruments had on AOCI and earnings during each of the last three years:
 
Classification in Statement of Operations
 
2017
 
2018
 
2019
Derivative Instruments
 
 
 
 
 
 
 
Currency derivatives designated as cash flow hedges:
 
 
 
 
 
 
 
Net gain (loss) recognized in AOCI
n/a
 
$
41

 
$
(54
)
 
$
69

Net gain (loss) reclassified from AOCI into earnings
Sales
 
40

 
(11
)
 
6

Currency derivatives designated as net investment hedge:
 
 
 
 
 
 
 
Net gain (loss) recognized in AOCI
n/a
 
8

 
—

 
—

Currency derivatives not designated as hedging instruments:
 
 
 
 
 
 
 
Net gain (loss) recognized in earnings
Sales
 
2

 
(5
)
 
6

Net gain (loss) recognized in earnings
Other income
 
(5
)
 
9

 
6

Non-Derivative Hedging Instruments
 
 
 
 
 
 
 
Foreign currency-denominated debt designated as net investment hedge:
 
 
 
 
 
 
 
Net gain (loss) recognized in AOCI
n/a
 
2

 
(41
)
 
45

Foreign currency-denominated debt not designated as hedging instrument:
 
 
 
 
 
 
 
Net gain (loss) recognized in earnings
Other income
 
3

 
(21
)
 
9

 
Schedule of fair values of derivative instruments
The following table presents the fair values of our derivative instruments as of April 30, 2018 and 2019:
 
Balance Sheet Classification
 
Fair Value of
Derivatives in a
Gain Position
 
Fair Value of
Derivatives in a
Loss Position
April 30, 2018
 
 
 
 
 
Designated as cash flow hedges:
 
 
 
 
 
Currency derivatives
Other current assets
 
$
2

 
$
(2
)
Currency derivatives
Other assets
 
1

 
—

Currency derivatives
Accrued expenses
 
4

 
(23
)
Currency derivatives
Other liabilities
 
2

 
(18
)
Not designated as hedges:
 
 
 
 
 
Currency derivatives
Accrued expenses
 
1

 
(5
)
April 30, 2019
 
 
 
 
 
Designated as cash flow hedges:
 
 
 
 
 
Currency derivatives
Other current assets
 
21

 
(2
)
Currency derivatives
Other assets
 
22

 
(1
)
Currency derivatives
Accrued expenses
 
—

 
(5
)
Currency derivatives
Other liabilities
 
—

 
(1
)
Not designated as hedges:
 
 
 
 
 
Currency derivatives
Accrued expenses
 
—

 
—
Offsetting Assets and Liabilities [Table Text Block]
The following table summarizes the gross and net amounts of our derivative contracts:
 
Gross Amounts of Recognized Assets (Liabilities)
 
Gross Amounts Offset in
Balance Sheet
 
Net Amounts Presented in Balance Sheet
 
Gross Amounts Not Offset in Balance Sheet
 
Net Amounts
April 30, 2018
 
 
 
 
 
 
 
 
 
Derivative assets
$
10

 
$
(9
)
 
$
1

 
$
(1
)
 
$
—

Derivative liabilities
(48
)
 
9

 
(39
)
 
1

 
(38
)
April 30, 2019
 
 
 
 
 
 
 
 
 
Derivative assets
43

 
(3
)
 
40

 
—

 
40

Derivative liabilities
(9
)
 
3

 
(6
)
 
—

 
(6
)