Commitments (Tables)

9 Months Ended

Jan. 31, 2014

Commitments and Contingencies Disclosure [Abstract]

Summary of Operating Leases

At January 31, 2014, we have commitments with respect to operating leases for aircraft, buildings, land and equipment. The minimum lease rentals required under operating leases are payable in the following amounts over the following years ended January 31:

	Aircraft operating leases		Building, land and equipment operating leases		Total operating leases
2014	$	256,461	$	13,543	$	270,004
2015	250,488		10,620		261,108
2016	226,336		9,156		235,492
2017	211,293		6,749		218,042
2018	197,625		5,471		203,096
and thereafter	383,881		54,351		438,232
	$	1,526,084	$	99,890	$	1,625,974