Collaborative and Other Licensing Arrangements (Narrative) (Details) - Collaborative and in-licensing arrangements $ in Millions	Jan. 25, 2018 USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Upfront licensing and milestone payments	$ 10.0
Potential future payments related to option fees and development, regulatory and commercialization milestones	$ 282.5

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration