Financial Assets and Liabilities that are Accounted For at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $)	Nov. 30, 2013	May 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net liabilities	$ 3,301,000	$ 4,051
Contingent Consideration Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net liabilities	2,059,000	2,047
Euro denominated long-term debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net liabilities	1,242,000	2,004
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net liabilities	1,242,000	2,004
Significant Other Observable Inputs (Level 2) | Euro denominated long-term debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net liabilities	1,242,000	2,004
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net liabilities	2,059,000	2,047
Significant Unobservable Inputs (Level 3) | Contingent Consideration Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net liabilities	$ 2,059,000	$ 2,047