Business Acquisitions, Goodwill and Other Intangible Assets - Net Assets Acquired (Details) - USD ($) $ in Thousands	Dec. 25, 2015	Nov. 30, 2015	Jun. 30, 2015
Identifiable intangible assets:
Goodwill	$ 101,697		$ 37,024
Pipeline Services
Business Acquisition [Line Items]
Cash and cash equivalents		$ 355
Accounts receivable		26,406
Prepaid expenses and other current assets		7,276
Property and equipment		3,552
Identifiable intangible assets:
Total identifiable intangible assets		44,500
Goodwill		64,673
Other non-current assets		20,683
Accounts payable		(2,587)
Accrued compensation and benefits		(7,199)
Other accrued liabilities		(5,210)
Current portion of long-term debt		(6,447)
Long-term debt, net of current portion		(18,547)
Net assets acquired		127,455
Pipeline Services | Customer relationships and backlog
Identifiable intangible assets:
Total identifiable intangible assets		43,500
Pipeline Services | Internally developed software
Identifiable intangible assets:
Total identifiable intangible assets		$ 1,000