Components of Changes in Other Comprehensive Loss (Detail) - USD ($) $ in Thousands		3 Months Ended
		Aug. 31, 2015	Aug. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance		$ (50,704)
Other comprehensive income (loss) before reclassifications		(6,221)
Reclassification adjustments to income	[1]	9,330
Income taxes		(608)	$ (582)
Accumulated other comprehensive loss, ending balance		(48,203)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance		(20,717)
Other comprehensive income (loss) before reclassifications		1,879
Accumulated other comprehensive loss, ending balance		(18,838)
Pension Liability Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance		(15,003)
Other comprehensive income (loss) before reclassifications		(8)
Accumulated other comprehensive loss, ending balance		(15,011)
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance		(14,984)
Other comprehensive income (loss) before reclassifications		(8,092)
Reclassification adjustments to income	[1]	9,330
Income taxes		(608)
Accumulated other comprehensive loss, ending balance		$ (14,354)

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