Venezuela's Highly Inflationary Economy - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended				3 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 28, 2014	Feb. 28, 2013	Jan. 31, 2013	Mar. 31, 2014 Subsequent Event SICAD-2	Feb. 28, 2013 Venezuela	Feb. 28, 2014 Venezuela
Investment in Country with High Inflationary Economy [Line Items]
Percentage of consolidated revenues from small service location			1.00%
Foreign currency exchange rate		6.3		6.3	5.3	50
Recognized losses related to the Venezuelan currency	$ (1,868,000)	$ (729,000)	$ (2,398,000)	$ (917,000)			$ (600,000)
Alternative state-run SICAD rate	11.8		11.8
Net assets of Venezuelan subsidiary								$ 2,400,000