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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2011
Cash flows from operating activities: |  |  |
Net income for the period | $ 148,520 | $ 125,174 | $ 123,203
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization of intangible assets | 186,851 | 159,485 | 129,130
Share-based compensation expense | 15,575 | 18,097 | 11,308
Excess tax benefits on share-based compensation expense | (915) | (2,723) | (1,888)
Pension expense | 910 | 543 | 552
Amortization of debt issuance costs | 2,123 | 1,703 | 1,359
Amortization of deferred charges and credits | 11,815 | 11,579 | 8,519
Loss on sale and write down of property and equipment | 24 | 203 | 12
Deferred taxes | (5,796) | (78,792) | (17,779)
Impairment and other non cash charges | 0 | 1,389 | (482)
Changes in operating assets and liabilities: |  |  |
Accounts receivable | 17,965 | 5,319 | 200
Prepaid expenses and other current assets | 4,242 | (2,079) | 1,833
Income taxes | (17,053) | 68,601 | 9,444
Deferred charges and credits | (9,274) | (22,035) | (29,071)
Accounts payable and accrued liabilities | (41,409) | (17,812) | (21,197)
Deferred revenue | 5,418 | (4,581) | 10,738
Other assets | (494) | 2,419 | (2,660)
Net cash provided by operating activities | 318,502 | 266,490 | 223,221
Cash flows from investing activities: |  |  |
Additions of property and equipment | (23,107) | (25,828) | (36,662)
Purchase of patents | (192) | (193) | 0
Purchase consideration for prior period acquisitions | (875) | (1,113) | (4,577)
Other investing activities | (3,750) | 0 | 518
Net cash used in investing activities | (374,394) | (281,539) | (287,268)
Cash flows from financing activities: |  |  |
Excess tax benefits on share-based compensation expense | 915 | 2,723 | 1,888
Proceeds from issuance of Common Shares | 16,347 | 21,270 | 11,512
Purchase of Treasury Stock | 0 | (10,888) | (12,499)
Proceeds from long-term debt and revolver | 0 | 648,500 | 0
Repayment of long-term debt and revolver | (30,677) | (349,187) | (3,575)
Debt issuance costs | 0 | (9,834) | (29)
Payments of dividends to shareholders | (17,703) | 0 | 0
Net cash provided by (used in) financing activities | (31,118) | 302,584 | (2,703)
Foreign exchange gain (loss) on cash held in foreign currencies | (2,292) | (11,928) | 24,698
Increase (decrease) in cash and cash equivalents during the period | (89,302) | 275,607 | (42,052)
Cash and cash equivalents at beginning of the period | 559,747 | 284,140 | 326,192
Cash and cash equivalents at end of the period | 470,445 | 559,747 | 284,140
System Solutions Australia Pty Limited [Member] |  |  |
Cash flows from investing activities: |  |  |
Purchase of business, net of cash acquired | (516) | (1,738) | 0
Operitel Corporation [Member] |  |  |
Cash flows from investing activities: |  |  |
Purchase of business, net of cash acquired | 0 | (7,014) | 0
Global 360 Holding Corporation [Member] |  |  |
Cash flows from investing activities: |  |  |
Purchase of business, net of cash acquired | 0 | (245,653) | 0
EasyLink Services International Corporation [Member] |  |  |
Cash flows from investing activities: |  |  |
Purchase of business, net of cash acquired | (315,331) | 0 | 0
Resonate KT Limited [Member] |  |  |
Cash flows from investing activities: |  |  |
Purchase of business, net of cash acquired | (19,366) | 0 | 0
ICCM Professional Services Limited [Member] |  |  |
Cash flows from investing activities: |  |  |
Purchase of business, net of cash acquired | (11,257) | 0 | 0
Streamserve Inc [Member] |  |  |
Cash flows from investing activities: |  |  |
Purchase of business, net of cash acquired | 0 | 0 | (57,221)
weComm Limited [Member] |  |  |
Cash flows from investing activities: |  |  |
Purchase of business, net of cash acquired | 0 | 0 | (20,198)
Metastorm Inc [Member] |  |  |
Cash flows from investing activities: |  |  |
Purchase of business, net of cash acquired | 0 | 0 | (168,657)
New Generation Consulting Inc. [Member] |  |  |
Cash flows from investing activities: |  |  |
Purchase of business, net of cash acquired | $ 0 | $ 0 | $ (471)

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration