Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Nov. 30, 2011	Nov. 30, 2010
Cash flows from operating activities:
Net income	$ 34,181	$ 30,488
Adjustments to reconcile net income to net cash provided from (used in) operating activities:
Depreciation and amortization	34,939	28,804
Amortization of stock-based compensation	6,125	5,828
Amortization of debt discount	6,502	6,051
Deferred tax provision	5,590	2,555
Tax benefits from exercise of stock options	(765)	(15)
Gain on extinguishment of debt		(97)
Earnings from joint ventures	(464)	(2,557)
Changes in certain assets and liabilities:
Accounts receivable	532	(14,191)
Inventories	(60,218)	(16,951)
Rotable spares and equipment on or available for short-term lease	441	(10,926)
Equipment on long-term lease	24,106	(129)
Accounts and trade notes payable	20,860	14,814
Accrued and other liabilities	(7,789)	(4,667)
Other, primarily program and overhaul costs	(59,241)	(9,195)
Net cash provided from operating activities	4,799	29,812
Cash flows from investing activities:
Property, plant and equipment expenditures	(55,153)	(59,930)
Proceeds from disposal of assets		21
Company acquired, net of cash	(19,522)
Proceeds from aircraft joint ventures	1,566	4,694
Investment in aircraft joint ventures	(938)	(4,483)
Other	(278)	(1,381)
Net cash used in investing activities	(74,325)	(61,079)
Cash flows from financing activities:
Change in short-term borrowings	50,000	14,991
Proceeds from borrowings	13,155
Reduction in borrowings	(10,878)	(10,482)
Reduction in capital lease obligations	(6,742)	(881)
Reduction in equity due to convertible bond repurchases		(236)
Cash dividends	(6,052)
Purchase of treasury stock	(3,659)	(2,539)
Stock option exercises	2,897	347
Tax benefits from exercise of stock options	765	15
Net cash provided from financing activities	39,486	1,215
Effect of exchange rate changes on cash	477	2
Decrease in cash and cash equivalents	(29,563)	(30,050)
Cash and cash equivalents, beginning of period	57,433	79,370
Cash and cash equivalents, end of period	$ 27,870	$ 49,320