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Additional Cash Flow Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2010
Additional cash flow information
Cash interest paid	$ 60,924	$ 59,473	$ 110,163	$ 132,453	$ 63,413
Cash taxes paid	24,137	8,252	15,584	21,986	21,205
Extinguishment of shareholder loan on redemption of capital stock					7,808
Assets acquired through non-cash capital leases	27,613	48,529	48,529	126,415
Assets under construction related to aircraft purchase contracts novated to lessors					$ 45,306

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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- Definition

The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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