Summary of Significant Accounting Policies - Net Sales Adjustments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Summary of Significant Accounting Policies
Reserves, net of accounts receivable	$ 218,500	$ 175,800
Rebates payable	$ 41,267	$ 44,593

Represents the carrying value as of the balance sheet date of obligations incurred and payable, pertaining to certain rebate programs primarily related to Medicare Part D, Medicaid and certain sales allowances and other adjustments paid to indirect customers.

No definition available.

Name:	lci_AccruedLiabilitiesForCertainRebateProgramsCurrent
Namespace Prefix:	lci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant