Segment Reporting (Narrative) (Detail) - 12 months ended Jun. 30, 2015	DarkFiber segment
Segment Reporting Information [Line Items]
Number of reportable segments | segment	3
Physical Infrastructure [Member] | Minimum [Member]
Segment Reporting Information [Line Items]
Number of dark fiber leased to customers	2
Contract term	3 years
Physical Infrastructure [Member] | Maximum [Member]
Segment Reporting Information [Line Items]
Number of dark fiber leased to customers	12
Contract term	20 years
Cloud and Connectivity [Member] | Minimum [Member]
Segment Reporting Information [Line Items]
Contract term	2 years
Cloud and Connectivity [Member] | Maximum [Member]
Segment Reporting Information [Line Items]
Contract term	5 years
Other [Member]
Segment Reporting Information [Line Items]
Contract term	1 year