Condensed Consolidated Statements of Cash Flows (USD $) In Thousands	3 Months Ended
	Aug. 31, 2011	Aug. 31, 2010
Cash flows from operating activities:
Net income	$ 16,649	$ 13,674
Adjustments to reconcile net income to net cash provided from (used in) operating activities:
Depreciation and amortization	16,699	14,367
Amortization of stock-based compensation	2,617	2,623
Amortization of debt discount	3,220	3,011
Deferred tax provision	2,779	1,352
Tax benefits from exercise of stock options	(765)	(1)
Gain on extinguishment of debt		(97)
Earnings from joint ventures	(205)	(28)
Changes in certain assets and liabilities:
Accounts receivable	(9,001)	(2,859)
Inventories	(36,755)	(8,482)
Rotable spares and equipment on or available for short-term lease	(8,269)	(15,276)
Equipment on long-term lease	19,446	2,076
Accounts and trade notes payable	4,993	15,221
Accrued and other liabilities	(5,115)	(7,097)
Other, primarily deposits and program costs	(31,905)	(11,266)
Net cash provided from (used in) operating activities	(25,612)	7,218
Cash flows from investing activities:
Property, plant and equipment expenditures	(41,751)	(37,046)
Proceeds from disposal of assets		15
Proceeds from aircraft joint ventures		598
Investment in aircraft joint ventures	(401)	(1,207)
Other	(109)	(1,188)
Net cash used in investing activities	(42,261)	(38,828)
Cash flows from financing activities:
Change in short-term borrowings	50,000	14,991
Reduction in borrowings	(3,060)	(7,446)
Reduction in capital lease obligations	(471)	(436)
Reduction in equity due to convertible bond repurchases		(236)
Cash dividends	(3,034)
Purchase of treasury stock	(1,038)	(2,539)
Stock option exercises	2,897	47
Tax benefits from exercise of stock options	765	1
Net cash proivded from financing activities	46,059	4,382
Effect of exchange rate changes on cash	(96)	13
Decrease in cash and cash equivalents	(21,910)	(27,215)
Cash and cash equivalents, beginning of period	57,433	79,370
Cash and cash equivalents, end of period	$ 35,523	$ 52,155