Retirement-Related Benefit Plans' Impact on Income Before Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 28, 2014	Feb. 28, 2013
Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 6,764	$ 6,488	$ 20,292	$ 19,464
Interest cost	4,510	4,060	13,530	12,180
Expected return on plan assets	(5,190)	(4,358)	(15,571)	(13,074)
Amortization of:
Prior service cost (credit)	84	87	251	261
Net actuarial (gains) losses recognized	3,305	4,222	9,916	12,666
Net Periodic Benefit Cost	9,473	10,499	28,418	31,497
Pension Benefits, Non-U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	1,109	1,050	3,327	3,150
Interest cost	1,799	1,769	5,398	5,307
Expected return on plan assets	(2,096)	(1,846)	(6,287)	(5,538)
Amortization of:
Prior service cost (credit)	1	2	3	6
Net actuarial (gains) losses recognized	624	692	1,871	2,076
Net Periodic Benefit Cost	1,437	1,667	4,312	5,001
Postretirement Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	81	88	243	264
Amortization of:
Prior service cost (credit)	(22)	(22)	(66)	(66)
Net actuarial (gains) losses recognized	(29)	4	(87)	12
Net Periodic Benefit Cost	30	70	90	210
Postretirement Benefits, Non-U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	327	288	981	864
Interest cost	317	289	951	867
Amortization of:
Net actuarial (gains) losses recognized	134	114	401	342
Net Periodic Benefit Cost	$ 778	$ 691	$ 2,333	$ 2,073