Summary of Significant Accounting Policies (Tables)

12 Months Ended

May 31, 2019

Schedule of net contract assets and liabilities

	May 31, 2019		June 1, 2018		Change
Contract assets – current	$	59.2	$	49.6	$	9.6
Contract assets – non-current		17.0		12.9		4.1
Deferred revenue – current		(12.6)		(9.4)		(3.2)
Deferred revenue on long-term contracts		(83.8)		(34.7)		(49.1)
Net contract assets (liabilities)	$	(20.2)	$	18.4	$	(38.6)

Schedule of change in our allowance for doubtful accounts

	May 31,
	2019		2018		2017
Balance, beginning of year	$	7.5	$	4.9	$	3.3
Provision charged to operations		15.8		0.5		2.1
Recoveries, deductions for accounts written off and other reclassifications		(7.3)		2.1		(0.5)
Balance, end of year	$	16.0	$	7.5	$	4.9

Schedule of goodwill by reportable segment

	Aviation		Expeditionary
	Services		Services		Total
Balance as of May 31, 2017	$	86.3	$	19.3	$	105.6
Acquisition		12.5		—		12.5
Foreign currency translation adjustments		0.6		—		0.6
Balance as of May 31, 2018		99.4		19.3		118.7
Finalization of purchase price allocation		(1.0)		—		(1.0)
Foreign currency translation adjustments		(1.5)		—		(1.5)
Balance as of May 31, 2019	$	96.9	$	19.3	$	116.2

Schedule of intangible assets, other than goodwill

	May 31, 2019
			Accumulated
	Gross		Amortization		Net
Amortizableintangible assets:
Customer relationships	$	25.5	$	(15.6)	$	9.9
Lease agreements		22.5		(14.0)		8.5
Other		3.4		(0.7)		2.7
		51.4		(30.3)		21.1
Unamortized intangible assets:
Trademarks		1.1		—		1.1
	$	52.5	$	(30.3)	$	22.2

	May 31, 2018
			Accumulated
	Gross		Amortization		Net
Amortizableintangible assets:
Customer relationships	$	26.3	$	(13.9)	$	12.4
Lease agreements		22.5		(12.6)		9.9
Other		11.2		(6.8)		4.4
		60.0		(33.3)		26.7
Unamortized intangible assets:
Trademarks		1.1		—		1.1
	$	61.1	$	(33.3)	$	27.8

Schedule of accounts receivable

	May 31,
	2019		2018
U.S. Government contracts:
Trade receivables	$	28.7	$	31.9
Unbilled receivables		31.7		13.4
		60.4		45.3
All other customers:
Trade receivables		92.5		96.2
Unbilled receivables		44.9		60.5
		137.4		156.7
	$	197.8	$	202.0

Summary of inventories

	May 31,
	2019		2018
Aircraft and engine parts, components and finished goods	$	467.9	$	383.5
Raw materials and parts		41.8		45.1
Work-in-process		14.0		32.1
	$	523.7	$	460.7

Schedule of supplemental information on cash flows

	For the Year Ended
	May 31,
	2019		2018		2017
Interest paid	$	8.8	$	7.2	$	4.4
Income taxes paid		7.0		17.0		12.7
Income tax refunds and interest received		6.4		0.1		1.3

ASU 2014-09

Schedule of impact of the adoption of ASC 606

	As of		ASC 606		As of
	May 31, 2018		Adjustments		June 1, 2018
Accounts receivable, net	$	202.0	$	(31.4)	$	170.6
Inventories		460.7		(17.3)		443.4
Contract assets–current		—		49.6		49.6
Other current assets		26.2		(0.9)		25.3
Other non-current assets		118.9		(19.0)		99.9
Accrued liabilities		138.3		9.1		147.4
Deferred tax liabilities		15.7		(6.6)		9.1
Deferred revenue on long-term contracts		35.8		(1.1)		34.7
Retained earnings		733.2		(20.4)		712.8

ASU 2014-09 | Balances Excluding ASC 606

Schedule of impact of the adoption of ASC 606

	As of May 31, 2019
					Balances
			ASC 606		Excluding
	As Reported		Adjustments		ASC 606
Accounts receivable, net	$	197.8	$	38.5	$	236.3
Contract assets–current		59.2		(59.2)		—
Inventories		523.7		22.2		545.9
Other current assets		36.2		(0.4)		35.8
Other non-current assets		77.5		25.3		102.8
Accrued liabilities		140.5		(5.9)		134.5
Deferred tax liabilities		—		6.6		6.6
Deferred revenue on long-term contracts		83.8		5.2		89.0
Retained earnings		709.8		20.5		730.3

	Fiscal Year Ended May 31, 2019
					Balances
			ASC 606		Excluding
	As Reported		Adjustments		ASC 606
Sales	$	2,051.8	$	(5.0)	$	2,046.8
Cost of sales		1,722.3		(5.1)		1,717.2
Operating income		98.3		0.1		98.4
Provision for income taxes		4.9		—		4.9
Income from continuing operations		84.1		0.1		84.2

	Fiscal Year Ended May 31, 2019
					Balances
			ASC 606		Excluding
	As Reported		Adjustments		ASC 606
Cash flows provided from operating activities:
Net income	$	7.5	$	0.1	$	7.6
Income from continuing operations		84.1		0.1		84.2
Accounts receivable		(34.4)		(7.1)		(41.5)
Contract assets		(9.7)		9.7		—
Inventories		(80.9)		(4.9)		(85.8)
Accrued and other liabilities		22.9		3.2		26.1
Other		21.6		(1.0)		20.6