Short-Term Borrowings and Credit Lines - Notes Payable to Banks and Interest Bearing Accounts Payable to Sojitz Corporation of America (Detail) - USD ($)	May 31, 2017	May 31, 2016
Notes payable:
TOTAL NOTES PAYABLE	$ 325,000,000	$ 1,000,000
Sojitz America
Interest-bearing accounts payable:
Sojitz America	$ 51,000,000	$ 39,000,000
Sojitz America - interest rate	1.78%	1.27%
Commercial paper
Notes payable:
TOTAL NOTES PAYABLE	$ 325,000,000	$ 0
Notes payable - interest rate	0.86%	0.00%
Notes Payable
Notes payable:
TOTAL NOTES PAYABLE	$ 325,000,000	$ 1,000,000
Notes Payable | UNITED STATES
Notes payable:
TOTAL NOTES PAYABLE	$ 0	$ 0
Notes payable - interest rate	0.00%	0.00%
Notes Payable | Non-U.S. operations
Notes payable:
TOTAL NOTES PAYABLE	$ 0	$ 1,000,000
Notes payable - interest rate	0.00%	13.00%