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Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets
 12 Months Ended
Jun. 30, 2017
Goodwill and Intangible Assets [Abstract]  
GOODWILL AND OTHER INTANGIBLE ASSETS
GOODWILL AND OTHER INTANGIBLE ASSETS
A summary of the carrying amount of goodwill attributable to each segment, as well as the changes in such, is as follows:
(in thousands)
Industrial
 
Widia
 
Infrastructure
 
Total
Gross goodwill
$
414,298

 
$
41,073

 
$
640,360

 
$
1,095,731

Accumulated impairment losses
(137,204
)
 
(13,638
)
 
(527,500
)
 
(678,342
)
Balance as of June 30, 2015
$
277,094

 
$
27,435

 
$
112,860

 
$
417,389

 
 
 
 
 
 
 
 
Activity for 2016:
 
 
 
 
 
 
 
Divestiture
(1,075
)
 
—

 
(6,461
)
 
(7,536
)
Translation
(4,518
)
 
(449
)
 
(688
)
 
(5,655
)
Change in gross goodwill
(5,593
)
 
(449
)
 
(7,149
)
 
(13,191
)
Impairment charges
—

 
—

 
(105,711
)
 
—

 
 
 
 
 
 
 
 
Gross goodwill
408,705

 
40,624

 
633,211

 
1,082,540

Accumulated impairment losses
(137,204
)
 
(13,638
)
 
(633,211
)
 
(784,053
)
Balance as of June 30, 2016
$
271,501

 
$
26,986

 
$
—

 
$
298,487

 
 
 
 
 
 
 
 
Activity for 2017:
 
 
 
 
 
 
 
Change in gross goodwill due to translation
1,989

 
891

 
—

 
2,880

 
 
 
 
 
 
 
 
Gross goodwill
410,694

 
41,515

 
633,211

 
1,085,420

Accumulated impairment losses
(137,204
)
 
(13,638
)
 
(633,211
)
 
(784,053
)
Balance as of June 30, 2017
$
273,490

 
$
27,877

 
$
—

 
$
301,367


The components of our other intangible assets were as follows: 
 
Estimated
Useful Life
(in years)
 
June 30, 2017
 
 
June 30, 2016
(in thousands)
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
 
Gross Carrying
Amount
 
Accumulated
Amortization
Contract-based
3 to 15
 
$
7,064

 
$
(7,014
)
 
 
$
7,152

 
$
(6,886
)
Technology-based and other
4 to 20
 
46,461

 
(29,061
)
 
 
47,323

 
(27,011
)
Customer-related
10 to 21
 
205,502

 
(74,669
)
 
 
205,471

 
(66,938
)
Unpatented technology
10 to 30
 
31,754

 
(10,589
)
 
 
31,837

 
(4,614
)
Trademarks
5 to 20
 
12,401

 
(8,648
)
 
 
12,668

 
(8,644
)
Trademarks
Indefinite
 
17,326

 
—

 
 
16,850

 
—

Total
 
 
$
320,508

 
$
(129,981
)
 
 
$
321,301

 
$
(114,093
)

Amortization expense for intangible assets was $16.6 million, $20.8 million and $26.7 million for 2017, 2016 and 2015, respectively. Estimated amortization expense for 2018 through 2022 is $14.5 million, $14.1 million, $13.8 million, $13.5 million, and $13.1 million, respectively.