XML 51 R40.htm IDEA: XBRL DOCUMENT v3.7.0.1
Debt and Financing Arrangements - Summary of Unsecured Credit Facility (Detail)
Jun. 30, 2017
Jun. 30, 2016
Debt Instrument [Line Items]    
Weighted average rates 2.60% 2.38%
Minimum [Member]    
Debt Instrument [Line Items]    
Range of effective rates 2.19% 1.82%
Maximum [Member]    
Debt Instrument [Line Items]    
Range of effective rates 4.75% 3.50%