Supplemental Guarantor Financial Information (Condensed Consolidating Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Supplemental Guarantor Financial Information [Line Items]
Cash and cash equivalents	$ 546.1	$ 591.7	$ 667.7	$ 569.4
Accounts and notes receivable, net	349.2	360.6	250.3
Inventories	851.1	744.4	790.6
Other current assets	174.0	116.1	106.3
Total current assets	1,920.4	1,812.8	1,814.9
Property, plant and equipment, net	241.0	270.2	273.4
Goodwill, net	36.9	37.0	37.4
Other assets, net	39.0	55.1	82.3
Total assets	2,237.3	2,175.1	2,208.0
Current maturities of long-term debt	275.2
Accounts payable	386.2	348.2	344.6
Accrued expenses and other current liabilities	286.1	315.4	299.5
Total current liabilities	947.5	663.6	644.1
Long-term debt, excluding current maturities	474.0	670.6	666.4
Other non-current liabilities	153.4	87.6	98.0
Total liabilities	1,574.9	1,421.8	1,408.5
Stockholders' equity	662.4	753.3	799.5
Total liabilities and stockholders' equity	2,237.3	2,175.1	2,208.0
RadioShack Corporation [Member]
Supplemental Guarantor Financial Information [Line Items]
Cash and cash equivalents	159.1	154.6	144.9	109.7
Accounts and notes receivable, net	313.3	294.1	214.7
Inventories	752.7	658.8	701.1
Other current assets	166.5	110.7	102.3
Total current assets	1,391.6	1,218.2	1,163.0
Property, plant and equipment, net	223.3	238.9	243.6
Goodwill, net		3.0	2.9
Other assets, net	28.4	43.6	58.0
Investment in subsidiaries	2,095.2	2,033.0	1,996.6
Total assets	3,738.5	3,536.7	3,464.1
Current maturities of long-term debt	275.2
Accounts payable	317.7	292.9	279.3
Accrued expenses and other current liabilities	230.2	264.3	250.4
Intercompany payables	256.8	175.4	232.5
Intercompany notes payable	1,415.3	1,320.7	1,166.5
Total current liabilities	2,495.2	2,053.3	1,928.7
Long-term debt, excluding current maturities	474.0	670.6	666.4
Other non-current liabilities	106.9	59.5	69.5
Total liabilities	3,076.1	2,783.4	2,664.6
Stockholders' equity	662.4	753.3	799.5
Total liabilities and stockholders' equity	3,738.5	3,536.7	3,464.1
Guarantor Subsidiaries [Member]
Supplemental Guarantor Financial Information [Line Items]
Cash and cash equivalents	369.3	404.9	500.4	427.4
Accounts and notes receivable, net	31.0	60.1	30.1
Inventories	55.8	57.4	66.7
Other current assets	0.9	0.8	1.5
Intercompany receivables	270.6	179.8	239.7
Intercompany notes receivable	1,415.3	1,320.7	1,166.5
Total current assets	2,142.9	2,023.7	2,004.9
Property, plant and equipment, net	7.4	22.7	22.5
Goodwill, net	0.5	0.5	0.5
Other assets, net	0.1	1.1	14.2
Investment in subsidiaries	77.4	70.1	64.9
Total assets	2,228.3	2,118.1	2,107.0
Accounts payable	50.5	26.4	54.2
Accrued expenses and other current liabilities	47.3	43.3	40.2
Total current liabilities	97.8	69.7	94.4
Other non-current liabilities	45.8	27.1	27.1
Total liabilities	143.6	96.8	121.5
Stockholders' equity	2,084.7	2,021.3	1,985.5
Total liabilities and stockholders' equity	2,228.3	2,118.1	2,107.0
Non-Guarantor Subsidiaries [Member]
Supplemental Guarantor Financial Information [Line Items]
Cash and cash equivalents	17.7	32.2	22.4	32.3
Accounts and notes receivable, net	4.9	6.4	5.5
Inventories	42.6	28.2	22.8
Other current assets	6.6	4.6	2.5
Total current assets	71.8	71.4	53.2
Property, plant and equipment, net	10.3	8.6	7.3
Goodwill, net	36.4	33.5	34.0
Other assets, net	10.5	10.4	10.1
Total assets	129.0	123.9	104.6
Accounts payable	18.0	28.9	11.1
Accrued expenses and other current liabilities	8.6	7.8	8.9
Intercompany payables	13.8	4.4	7.2
Total current liabilities	40.4	41.1	27.2
Other non-current liabilities	0.7	1.0	1.4
Total liabilities	41.1	42.1	28.6
Stockholders' equity	87.9	81.8	76.0
Total liabilities and stockholders' equity	129.0	123.9	104.6
Eliminations [Member]
Supplemental Guarantor Financial Information [Line Items]
Intercompany receivables	(270.6)	(179.8)	(239.7)
Intercompany notes receivable	(1,415.3)	(1,320.7)	(1,166.5)
Total current assets	(1,685.9)	(1,500.5)	(1,406.2)
Investment in subsidiaries	(2,172.6)	(2,103.1)	(2,061.5)
Total assets	(3,858.5)	(3,603.6)	(3,467.7)
Intercompany payables	(270.6)	(179.8)	(239.7)
Intercompany notes payable	(1,415.3)	(1,320.7)	(1,166.5)
Total current liabilities	(1,685.9)	(1,500.5)	(1,406.2)
Total liabilities	(1,685.9)	(1,500.5)	(1,406.2)
Stockholders' equity	(2,172.6)	(2,103.1)	(2,061.5)
Total liabilities and stockholders' equity	$ (3,858.5)	$ (3,603.6)	$ (3,467.7)