Summary of Significant Accounting Policies - Deferred Sales Commissions and Revenue Recognition (Details)	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2020
Ivy Funds Class B
Revenue Recognition
Maximum service plan fee (as a percent)			0.25%
Maximum distribution plan fee (as a percent)			0.75%
Ivy Funds Class C
Revenue Recognition
Maximum service plan fee (as a percent)			0.25%
Maximum distribution plan fee (as a percent)			0.75%
Ivy Funds Class E
Revenue Recognition
Maximum service plan fee (as a percent)			0.25%
Ivy Funds Class E | Maximum
Revenue Recognition
Sales charge (as a percent)	2.50%
Ivy Funds Class Y
Revenue Recognition
Maximum service plan fee (as a percent)			0.25%
Ivy Funds Class R
Revenue Recognition
Maximum service plan fee (as a percent)			0.50%
Ivy Funds Class A
Revenue Recognition
Maximum service plan fee (as a percent)			0.25%
Maximum distribution plan fee (as a percent)			0.25%
Ivy Funds Class A | Maximum
Revenue Recognition
Sales charge (as a percent)	3.50%	5.75%