Capital Stock (Tables)

6 Months Ended

Sep. 30, 2013

Equity and Share-based Compensation [Abstract]

Common Shares Reserved For Future Issuance

The table below outlines common shares reserved for future issuance:

	September 30, 2013	March 31, 2013
	(Amounts in thousands)
Stock options outstanding, average exercise price $18.25 (March 31, 2013 - $13.72)	8,552	6,421
Restricted share units — unvested	2,069	2,077
Share purchase options and restricted share units available for future issuance	4,479	12,341
Shares issuable upon conversion of October 2004 2.9375% Notes at conversion price of $11.50 per share	10	30
Shares issuable upon conversion of April 2009 3.625% Notes at conversion price of $8.25 per share	7,819	7,819
Shares issuable upon conversion of January 2012 4.00% Notes at conversion price of $10.50 per share	3,986	4,286
Shares issuable upon conversion of April 2013 1.25% Notes at conversion price of $30.00 per share	2,000	—
Shares reserved for future issuance	28,915	32,974

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Compensation Expense

The Company recognized the following share-based compensation expense during the three and six months ended September 30, 2013, and 2012:

	Three Months Ended			Three Months Ended		Six Months Ended			Six Months Ended
	September 30, 2013			September 30, 2012		September 30, 2013			September 30, 2012
	(Amounts in thousands)
Compensation Expense:
Stock Options	$	5,971		$	356	$	9,738		$	655
Restricted Share Units and Other Share-based Compensation	8,032			4,404		15,435			11,628
Stock Appreciation Rights	8,385			2,139		14,962			4,365
Total share-based compensation expense	$	22,388		$	6,899	$	40,135		$	16,648
Tax impact (1)	(8,284		)	—		(14,850		)	—
Reduction in net income	$	14,104		$	6,899	$	25,285		$	16,648

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(1) Represents the income tax benefit recognized in the statements of operations for share-based compensation arrangements.