Business Acquisitions - Additional Information (Detail) - USD ($) $ in Millions			12 Months Ended
	Feb. 27, 2015	Feb. 28, 2014	Jun. 30, 2015	Jun. 30, 2014
Business Acquisition [Line Items]
Increase in long-term liabilities			$ 2.0
Deferred grants, determined fair value			0.0
Decreased the deferred grants fair value			0.0
Decrease in goodwill			(10.7)
Business acquisition, cash transferred			$ 20.1	$ 223.5
Crescendo Biosciences, Inc.
Business Acquisition [Line Items]
Total consideration transferred		$ 259.0
Business acquisition, cash transferred		225.1
Elimination of intercompany balances related to accrued interest and term loan		25.9
Fair value of purchase option granted		8.0
Business acquisition, amount deposited into escrow account		20.0
Share-based compensation to Crescendo employees		6.9
Control bonuses paid to Crescendo employees		$ 5.7
Crescendo Biosciences, Inc. | Minimum
Business Acquisition [Line Items]
Period of audit completion		12 months
Crescendo Biosciences, Inc. | Maximum
Business Acquisition [Line Items]
Period of audit completion		15 months
German Clinic [Member]
Business Acquisition [Line Items]
Total consideration transferred	$ 20.1
Intangible asset amortization period for income tax purposes			15 years