Components of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance				$ (50,704)
Other comprehensive income (loss) before reclassifications				(19,255)
Reclassification adjustments to income	[1]			23,841
Income taxes		$ (3,075)	$ 6,086	(2,401)	$ 6,596
Accumulated other comprehensive loss, ending balance		(48,519)		(48,519)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance				(20,717)
Other comprehensive income (loss) before reclassifications				(1,254)
Accumulated other comprehensive loss, ending balance		(21,971)		(21,971)
Pension Liability Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance				(15,003)
Other comprehensive income (loss) before reclassifications				(98)
Accumulated other comprehensive loss, ending balance		(15,101)		(15,101)
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance				(14,984)
Other comprehensive income (loss) before reclassifications				(17,903)
Reclassification adjustments to income	[1]			23,841
Income taxes				(2,401)
Accumulated other comprehensive loss, ending balance		$ (11,447)		$ (11,447)

[1] The statement of earnings classification of amounts reclassified to income for cash flow hedges is disclosed in "NOTE O - Derivative Instruments and Hedging Activities."