Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Nov. 30, 2016	May 31, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total cash collateral	$ 154,000
Aggregate impact to fair value of derivative assets and liabilities as a result of recognition on a net basis	100,000	$ (300,000)
Losses in accumulated other comprehensive income expected to be reclassified into net earnings	(11,131,000)
Losses in accumulated other comprehensive income expected to be reclassified into net earnings, tax	$ (6,147,000)