Schedule of Acquisition of Identifiable Intangible Assets (Detail) - CryoScience $ in Thousands	9 Months Ended
	Feb. 29, 2016 USD ($)
Business Acquisition [Line Items]
Acquired finite lived intangible assets	$ 5,260
Technology
Business Acquisition [Line Items]
Acquired finite lived intangible assets	$ 2,800
Useful Life (Years)	20 years
Customer relationships
Business Acquisition [Line Items]
Acquired finite lived intangible assets	$ 2,200
Useful Life (Years)	15 years
Other Intangible Assets
Business Acquisition [Line Items]
Acquired finite lived intangible assets	$ 260
Useful Life (Years)	1 year