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, 2013	Feb. 29, 2012	Feb. 28, 2013	Feb. 29, 2012
Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 6,488	$ 4,976	$ 19,464	$ 14,929
Interest cost	4,060	3,826	12,180	11,480
Expected return on plan assets	(4,358)	(4,354)	(13,074)	(13,062)
Amortization of:
Prior service (credit)	87	88	261	264
Net actuarial (gains) losses recognized	4,222	2,127	12,666	6,382
Net Periodic Benefit Cost	10,499	6,663	31,497	19,993
Pension Benefits, Non-U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	1,050	965	3,150	2,896
Interest cost	1,769	2,040	5,307	6,121
Expected return on plan assets	(1,846)	(2,036)	(5,538)	(6,109)
Amortization of:
Prior service (credit)	2	2	6	8
Net actuarial (gains) losses recognized	692	560	2,076	1,679
Net Periodic Benefit Cost	1,667	1,531	5,001	4,595
Postretirement Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	88	104	264	312
Amortization of:
Prior service (credit)	(22)	(22)	(66)	(65)
Net actuarial (gains) losses recognized	4	(14)	12	(43)
Net Periodic Benefit Cost	70	68	210	204
Postretirement Benefits, Non-U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	288	192	864	576
Interest cost	289	250	867	749
Amortization of:
Net actuarial (gains) losses recognized	114	18	342	55
Net Periodic Benefit Cost	$ 691	$ 460	$ 2,073	$ 1,380