Subsequent Event (Details) - Long-term Debt [Member] - Term Loan Due Twenty-Nineteen [Member] - Subsequent Event [Member] $ in Millions	Jan. 28, 2016 USD ($)
Subsequent Event [Line Items]
Debt Instrument, Interest Rate Terms	Interest accrues on the term loan at a rate equal to LIBOR plus a margin of 1.125% per annum, which may increase to a rate equal to LIBOR plus a margin of up to 1.875% per annum, depending on Cadence’s leverage ratio.
Principal	$ 300.0
Debt instrument, term	3 years
Debt to EBITDA ratio	3.00
Debt Instrument, Covenant Description	The term loan includes customary negative covenants that, among other things, restrict Cadence’s ability to incur additional indebtedness, grant liens and make certain investments, asset dispositions and restricted payments. In addition, the term loan agreement contains certain financial covenants that require Cadence to maintain a funded debt to EBITDA ratio not greater than 2.75 to 1, with a step-up to 3.25 to 1 for one year following an acquisition by Cadence of at least $250.0 million that results in a pro forma leverage ratio between 2.50 to 1 and 3.00 to 1. The term loan agreement also requires Cadence to maintain an EBITDA to interest charges ratio of at least 3.00 to 1.
London Interbank Offered Rate (LIBOR) [Member]
Subsequent Event [Line Items]
Interest rate spread	1.125%
Scenario 1 [Member]
Subsequent Event [Line Items]
Debt to EBITDA ratio	2.75
Scenario 2 [Member]
Subsequent Event [Line Items]
Debt to EBITDA ratio	3.25
Debt to EBITDA ratio, term	1 year
Required business acquisition consideration	$ 250.0
Scenario 2 [Member] | Minimum [Member]
Subsequent Event [Line Items]
Pro forma leverage ratio	2.50
Scenario 2 [Member] | Maximum [Member]
Subsequent Event [Line Items]
Pro forma leverage ratio	3.00
Scenario 2 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Subsequent Event [Line Items]
Interest rate spread	1.875%