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Leases - Summary of Minimum Lease Payments for Operating Lease Liabilities (Parenthetical) (Detail) $ in Millions	Sep. 30, 2019 USD ($)
Leases [Abstract]
Non-cancelable future minimum lease payments for operating leases that have not yet commenced	$ 47.4

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- Definition

Non cancelable future minimum lease payments for operating leases not yet commenced.

+ References

No definition available.

+ Details

Name:	nbix_NonCancelableFutureMinimumLeasePaymentsForOperatingLeasesNotYetCommenced
Namespace Prefix:	nbix_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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