Summary of Significant Accounting Policies - Deferred Sales Commissions and Revenue Recognition (Details)	12 Months Ended
	Dec. 31, 2016
Class B
Deferred Sales Commissions
Amortization period of the cost incurred at the time of sale	5 years
Required holding period of shares	6 years
Maximum service plan fee (as a percent)	0.25%
Maximum distribution plan fee (as a percent)	0.75%
Class C
Deferred Sales Commissions
Amortization period of the cost incurred at the time of sale	12 months
Required holding period of shares	12 months
Maximum service plan fee (as a percent)	0.25%
Maximum distribution plan fee (as a percent)	0.75%
Asset allocation product
Deferred Sales Commissions
Required holding period of shares	3 years
Asset allocation product | Maximum
Deferred Sales Commissions
Amortization period of the cost incurred at the time of sale	3 years
Class A
Deferred Sales Commissions
Maximum service plan fee (as a percent)	0.25%
Maximum distribution plan fee (as a percent)	0.25%
Class A | Maximum
Deferred Sales Commissions
Sales charge (as a percent)	5.75%
Class E
Deferred Sales Commissions
Maximum service plan fee (as a percent)	0.25%
Class E | Maximum
Deferred Sales Commissions
Sales charge (as a percent)	5.75%
Ivy Funds Y
Deferred Sales Commissions
Maximum service plan fee (as a percent)	0.25%
Class R
Deferred Sales Commissions
Maximum service plan fee (as a percent)	0.50%