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Balance Sheet Details | 6 Months Ended
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Dec. 31, 2017
Balance Sheet Details |
Balance Sheet Details | 3. Balance Sheet Details The following tables provide details of selected balance sheet accounts (in thousands):
|  | June 30, 2017 |  | December 31, 2017 |
Accounts receivable |  | $ | 216,089 |  | $ | 219,462 |
Less allowance for doubtful accounts |  | (9,563 | ) | (11,008 | )
Total |  | $ | 206,526 |  | $ | 208,454 |
|  | June 30, 2017 |  | December 31, 2017 |
Raw materials |  | $ | 129,645 |  | $ | 140,275 |
Work-in-process |  | 65,454 |  | 77,922 |
Finished goods |  | 53,411 |  | 62,836 |
Total |  | $ | 248,510 |  | $ | 281,033 |
|  | Estimated |  |  |  |  |
|  | Useful |  | June 30, |  | December 31, |
|  | Lives |  | 2017 |  | 2017 |
Land |  | N/A |  | $ | 14,212 |  | $ | 17,129 |
Buildings, civil works and improvements |  | 5 - 40 years |  | 157,123 |  | 179,643 |
Leasehold improvements |  | 1 - 12 years |  | 9,025 |  | 9,308 |
Equipment and tooling |  | 3 - 10 years |  | 166,991 |  | 170,372 |
Furniture and fixtures |  | 3 - 13 years |  | 3,371 |  | 3,427 |
Computer equipment |  | 3 - 5 years |  | 17,991 |  | 19,054 |
Computer software |  | 3 - 10 years |  | 17,303 |  | 17,844 |
Computer software implementation in process |  | N/A |  | 2,590 |  | 3,676 |
Construction in process |  | N/A |  | 1,049 |  | 699 |
Total |  |  |  | 389,655 |  | 421,152 |
Less accumulated depreciation and amortization |  |  |  | (248,116 | ) | (277,882 | )
Property and equipment, net |  |  |  | $ | 141,539 |  | $ | 143,270 |
In September 2017, we purchased the AS&E facility in Billerica, MA for a purchase price of $19.8 million. Of this amount, $16.9 million was included in Buildings, civil works and improvements and $2.9 million was included in Land. Depreciation expense was approximately $13.4 million and $16.8 million for the three months ended December 31, 2016 and 2017, respectively, and approximately $26.7 million and $33.0 million for the six months ended December 31, 2016 and 2017, respectively.

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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