Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Dec. 31, 2020	Jun. 30, 2020
Current Assets:
Cash and cash equivalents	$ 309.9	$ 763.4
Short-term investments	7.0
Accounts receivable, net of allowances of $5.8 at December 2020 and June 2020	249.3	195.3
Inventories	73.1	102.0
Prepaid expenses and other current assets	32.3	16.9
Total current assets	671.6	1,077.6
Property and equipment at cost, net of accumulated depreciation of $129.0 and $131.2 at December 2020 and June 2020, respectively	93.6	84.3
Goodwill	568.6	360.8
Acquired intangibles, net	354.6	93.4
Non-current other assets	103.8	77.7
Total assets	1,792.2	1,693.8
Current Liabilities:
Accounts payable	74.4	60.6
Accrued compensation	37.5	59.5
Income taxes payable	16.2	33.0
Other accrued liabilities	97.4	91.0
Total current liabilities	225.5	244.1
Long-term debt	100.0	100.0
Convertible notes, net	496.1	486.6
Other long-term liabilities	82.6	44.0
Total liabilities	904.2	874.7
Stockholders' Equity:
$0.001 par value; 120,000,000 shares authorized, 66,677,341 and 65,871,648 shares issued, and 34,928,146 and 34,122,453 shares outstanding, at December 2020 and June 2020, respectively	0.1	0.1
Additional paid-in capital	1,362.3	1,340.2
Treasury stock: 31,749,195 common treasury shares at December 2020 and June 2020, at cost	(1,222.6)	(1,222.6)
Retained earnings	748.2	701.4
Total stockholders' equity	888.0	819.1
Liabilities and stockholders' equity	$ 1,792.2	$ 1,693.8

Convertible notes payable, net.

No definition available.

Name:	syna_ConvertibleNotesPayableNet
Namespace Prefix:	syna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).