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Stock-Based Compensation Stock-Based Compensation Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation $ 3,483us-gaap_ShareBasedCompensation $ 2,754us-gaap_ShareBasedCompensation
Continuing Operations    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation 3,483us-gaap_ShareBasedCompensation
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember		 2,723us-gaap_ShareBasedCompensation
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Continuing Operations | Restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation 3,372us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember		 2,610us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Continuing Operations | Employee stock purchase plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation $ 111us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember		 $ 113us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember