Capital Stock (Share-Based Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	$ 17,322		$ 22,388		$ 33,743		$ 40,135
Impact of accelerated vesting on stock options and restricted share units	0	[1]	0	[1]	1,194	[1]	0	[1]
Total share-based compensation expense	17,322		22,388		34,937		40,135
Tax impact	(6,350)	[2]	(8,284)	[2]	(12,808)	[2]	(14,850)	[2]
Reduction in net income	10,972		14,104		22,129		25,285
Stock Options [Member]
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	9,366		5,971		18,009		9,738
Restricted Share Units and Other Share-based Compensation [Member]
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	6,989		8,032		13,038		15,435
Stock Appreciation Rights (SARs) [Member]
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	$ 967		$ 8,385		$ 2,696		$ 14,962

[1] Represents the impact of the acceleration of certain vesting schedules for stock options and restricted share units pursuant to the severance arrangements related to the integration of the marketing operations of the Company's Lionsgate and Summit film labels.

[2] Represents the income tax benefit recognized in the statements of income for share-based compensation arrangements.