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Taxes (Tables)
 12 Months Ended
May 31, 2018
Income Tax And Non Income Tax Disclosure [Abstract]  
Schedule of income from continuing operations
The components of Earnings (loss) from continuing operations before income taxes for the fiscal years ended May 31 were:
 
2018
 
2017
 
2016
United States
$
(18.4
)
 
$
78.7

 
$
62.1

Non-United States
16.9

 
9.2

 
6.6

Total
$
(1.5
)
 
$
87.9

 
$
68.7
Schedule of income tax expense (benefit)
The provision for income taxes from continuing operations for the fiscal years ended May 31 consisted of the following components: 
 
2018
 
2017
 
2016
Current
 

 
 

 
 

Federal
$
(3.6
)
 
$
8.3

 
$
(4.0
)
State and local
0.7

 
1.8

 
4.1

Non-United States
4.9

 
5.4

 
4.1

Total Current
$
2.0

 
$
15.5

 
$
4.2

 
 
 
 
 
 
Deferred
 

 
 

 
 

Federal
$
5.0

 
$
17.7

 
$
19.2

State and local
(3.5
)
 
2.2

 
1.8

Non-United States
—

 
—

 
(0.5
)
Total Deferred
$
1.5

 
$
19.9

 
$
20.5

 
 
 
 
 
 
 Total Current and Deferred
$
3.5

 
$
35.4

 
$
24.7
Schedule of effective income tax rate reconciliation
A reconciliation of the significant differences between the effective income tax rate and the federal statutory rate on Earnings (loss) from continuing operations before income taxes for the fiscal years ended May 31 was as follows:
 
2018
 
2017
 
2016
Computed federal statutory provision
29.2
 %
 
35.0
 %
 
35.0
 %
State income tax provision, net of federal income tax benefit
37.1

 
3.3

 
3.7

Difference in effective tax rates on earnings of foreign subsidiaries
(1.3
)
 
0.0

 
1.2

Charitable contributions
28.6

 
(0.3
)
 
(0.4
)
Tax credits
42.8

 
(0.5
)
 
(0.3
)
Valuation allowances
68.1

 
0.1

 
(0.7
)
Uncertain Positions
110.3

 
2.9

 
3.9

Remeasurement of deferred tax balances
(371.3
)
 
—

 
—

Permanent Differences
(177.6
)
 
(0.3
)
 
(6.0
)
Other - net
0.8

 
0.1

 
(0.4
)
Effective tax rates
(233.3
)%
 
40.3
 %
 
36.0
 %
Total provision for income taxes
$
3.5

 
$
35.4

 
$
24.7
Schedule of deferred tax assets and liabilities
The significant components for deferred income taxes for the fiscal years ended May 31 were as follows: 
 
2018
 
2017
Deferred tax assets:
 

 
 

Tax uniform capitalization
$
9.6

 
$
9.5

Prepublication expenses
0.7

 
7.8

Inventory reserves
15.0

 
24.6

Allowance for doubtful accounts
2.2

 
3.3

Other reserves
16.9

 
26.0

Postretirement, post employment and pension obligations
7.1

 
12.5

Tax carryforwards
26.9

 
24.1

Other - net
13.7

 
14.8

Gross deferred tax assets
$
92.1

 
$
122.6

Valuation allowance
(25.1
)
 
(24.8
)
Total deferred tax assets
$
67.0

 
$
97.8

Deferred tax liabilities:
 

 
 

Prepaid expenses
(0.4
)
 
(0.4
)
Depreciation and amortization
(41.4
)
 
(43.7
)
Total deferred tax liability
$
(41.8
)
 
$
(44.1
)
Total net deferred tax assets
$
25.2

 
$
53.7
Schedule of unrecognized tax benefits rollforward
reconciliation of the unrecognized tax benefits for the fiscal years indicated: 
Gross unrecognized benefits at May 31, 2015
$
17.3

Decreases related to prior year tax positions
(6.2
)
Increase related to prior year tax positions
4.3

Increases related to current year tax positions
5.4

Settlements during the period
(2.9
)
Lapse of statute of limitation
—

Gross unrecognized benefits at May 31, 2016
$
17.9

Decreases related to prior year tax positions
(6.3
)
Increase related to prior year tax positions
0.1

Increases related to current year tax positions
3.0

Settlements during the period
(0.6
)
Lapse of statute of limitation
—

Gross unrecognized benefits at May 31, 2017
$
14.1

Decreases related to prior year tax positions
(2.6
)
Increase related to prior year tax positions
0.4

Increases related to current year tax positions
0.5

Settlements during the period
(1.9
)
Lapse of statute of limitation
(0.4
)
Gross unrecognized benefits at May 31, 2018
$
10.1