Components of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of May 31, 2016				$ 919,846
Income taxes		$ 460	$ (3,075)	(398)	$ (2,401)
Balance as of February 28, 2017		1,022,047		1,022,047
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of May 31, 2016				(18,728)
Other comprehensive income (loss) before reclassifications				(7,142)
Balance as of February 28, 2017		(25,870)		(25,870)
Pension Liability Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of May 31, 2016				(17,061)
Other comprehensive income (loss) before reclassifications				(117)
Income taxes				82
Balance as of February 28, 2017		(17,096)		(17,096)
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of May 31, 2016				7,224
Other comprehensive income (loss) before reclassifications				10,112
Reclassification adjustments to income	[1]			(8,276)
Income taxes				(480)
Balance as of February 28, 2017		8,580		8,580
Accumulated Other Comprehensive Loss, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of May 31, 2016				(28,565)
Other comprehensive income (loss) before reclassifications				2,853
Reclassification adjustments to income	[1]			(8,276)
Income taxes				(398)
Balance as of February 28, 2017		$ (34,386)		$ (34,386)

[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."