Summary of Estimated Fair Values of Separately Identifiable Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) (Pathfinder Therapeutics Inc)	9 Months Ended
Apr. 30, 2015
Developed technologies
Business Acquisition [Line Items]
Weighted average useful life	10 years
Customer relationships
Business Acquisition [Line Items]
Weighted average useful life	2 years
Trade names
Business Acquisition [Line Items]
Weighted average useful life	5 years

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration